The route AB is 60km long. At 7 am, one motorbike travels from A to B with a constant speed. When this motorbike reaches B, it returns to A immediately with the speed increase by 10km/h and reaches A...

LS

Lê Song Phương

6 tháng 1 2022

The route AB is 60km long. At 7 am, one motorbike travels from A to B with a constant speed. When this motorbike reaches B, it returns to A immediately with the speed increase by 10km/h and reaches A at 10.30 am at the same day. What is the original speed of this motorbike?

#Toán lớp 9

3

LS

Lê Song Phương

6 tháng 1 2022

Note: You must write your answer in English.

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LS

Lê Song Phương

6 tháng 1 2022

Note: You must write your answer in English.

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TD

Trần Đức Huy

9 tháng 3 2017

Câu hỏi hay

At 8:24 AM,a motorbike travels from A to B at a speed of 36 km/h.At 9:00 AM,a car travels from A to B at a speed of 54km/h and is able to catch up with the motorbike at B.Find the distance from A to B in kilometers.

#Toán lớp 5

37

PT

Phan Thanh Tịnh

10 tháng 3 2017

Dịch : Lúc 8 giờ 24 phút,một chiếc xe máy đi từ A đến B với vận tốc 36 km/h.Lúc 9 giờ,một chiếc ô tô đi từ A đến B với vận tốc 54 km/h và đuổi kịp xe máy tại B.Quãng đường AB dài bao nhiêu km ?

Giải : Xe máy đi trước ô tô : 9 giờ - 8 giờ 24 phút = 36 phút = 0,6 giờ

Khi ô tô khởi hành thì 2 xe cách nhau : 36 x 0,6 = 21,6 (km)

Hiệu vận tốc 2 xe là : 54 - 36 = 18 (km/h)

Ô tô đuổi kịp xe máy sau : 21,6 : 18 = 1,2 (giờ)

Quãng đường AB là : 54 x 1,2 = 64,8 (km)

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NT

nguyen tien dung

10 tháng 3 2017

k cho mik đã

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NT

Nguyễn Tấn Dũng

10 tháng 4 2017

Mr.Joseph drives car from A to B at a constant speed. If the speed of the car is increased by 20%, it takes him one hour less than the usual time. If he drives at the constant speed for the first 100km before increasing the speed by 30%, it also takes him one hour less than the usual. The distance of AB is ..........km.

#Toán lớp 8

3

DK

duy khang nguyễn

12 tháng 4 2017

Gọi S là quãng đường
v là vận tốc

t là thời gian Mr.J đi thường ngày

=>\(\dfrac{S}{120\%v}=t-1\)

\(\dfrac{100}{v}+\dfrac{S-100}{130\%v}=t-1\)

=>\(\dfrac{S}{120\%v}=\dfrac{100}{v}+\dfrac{S-100}{130\%v}\)

<=>\(\dfrac{130S}{156v}=\dfrac{15600+120S-12000}{156v}\)

<=>\(10S=3600\)

<=>\(S=360\)

Xong rầu đó khỏi cảm ơn

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MD

Mỹ Duyên

11 tháng 4 2017

Đáp án: AB = 360 km

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AA

Ai Ai

22 tháng 7 2020

A person travel from A to B at a constant speed v = 4 km / h. After he travelling \(\frac{2}{3}\) of the distance, he speed up 25% velocities. It takes 28 minutes to go A to B. The length of AB is.....

#Toán lớp 8

0

AW

Alan Walker

20 tháng 4 2016

At 7 hours and 30 minutes, an automobile going from A to B, to 11 hours, the cars arrive. The speed of the cars is 60km / h. Calculate the distance AB

#Toán lớp 5

2

VT

Vu Thi Nhu

21 tháng 4 2016

Are you sure about ' cars' in the problem. However, I can show you in case the problem can be true.

The car spends 11h-7h30min= 3h30min to go from A to B.

Since the speed of car is 60 km/h.

Applying the operation s=vt, we have

The distance AB=s= 60 × 3h30min= 210km.

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TN

Trương Ngọc Cừng

2 tháng 5 2016

210 kilometer

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LQ

Lê Quỳnh Anh

15 tháng 6 2018

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questionsThe observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.The physical attributes of the...

Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

The observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.

The physical attributes of the site allow its use as a natural calendar/clock. The "hole" at Hole in the Rock is formed by two large overhanging rocks coming together at a point, creating a shelter with an opening large enough for several persons to pass through. The northeast-facing overhang has a smaller opening in its roof. It is this smaller hole that produces the attributes that may have been used as a calendar/clock.

Because of its location in the shelter's roof, a beam of sunlight can pass through this second hole and cast a spot onto the shelter's wall and floor. This spot of light travels from west to east as the sun moves across the sky. It also moves from north to south and back again as the Earth travels around the Sun. the west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.

The spot first appears and starts down the surface of the wall of the shelter at different times of the morning depending on the time of the year. The spot grows in size from its first appearance until its maximum size is achieved roughly at midday. It then continues its downward movement until it reaches a point where it jumps to the floor of the shelter. As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders. If a person is seated on a certain one of these rocks as the spot reaches it, the Sun can be viewed through the calendar hole. This occurs at different times in the afternoon depending on the time of year.

The word establish is closest in meaning to __________.

A. consult

B. locate

C. choose

D. create

#Mẫu giáo

1

DH

Dương Hoàn Anh

15 tháng 6 2018

D To establish = to create = thành lập, thiết lập, tạo thành

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LQ

Lê Quỳnh Anh

25 tháng 8 2018

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questionsThe observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.The physical attributes of the...

Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

The observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.

The physical attributes of the site allow its use as a natural calendar/clock. The "hole" at Hole in the Rock is formed by two large overhanging rocks coming together at a point, creating a shelter with an opening large enough for several persons to pass through. The northeast-facing overhang has a smaller opening in its roof. It is this smaller hole that produces the attributes that may have been used as a calendar/clock.

Because of its location in the shelter's roof, a beam of sunlight can pass through this second hole and cast a spot onto the shelter's wall and floor. This spot of light travels from west to east as the sun moves across the sky. It also moves from north to south and back again as the Earth travels around the Sun. the west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.

The spot first appears and starts down the surface of the wall of the shelter at different times of the morning depending on the time of the year. The spot grows in size from its first appearance until its maximum size is achieved roughly at midday. It then continues its downward movement until it reaches a point where it jumps to the floor of the shelter. As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders. If a person is seated on a certain one of these rocks as the spot reaches it, the Sun can be viewed through the calendar hole. This occurs at different times in the afternoon depending on the time of year.

The word attributes is closest in meaning to __________.

A. locations

B. characteristics

C. changes

D. dimensions

#Mẫu giáo

1

DH

Dương Hoàn Anh

25 tháng 8 2018

B Attribute = charateristic = thuộc tính, đặc tính

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LQ

Lê Quỳnh Anh

20 tháng 5 2018

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questionsThe observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.The physical attributes of the...

Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

The observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.

The physical attributes of the site allow its use as a natural calendar/clock. The "hole" at Hole in the Rock is formed by two large overhanging rocks coming together at a point, creating a shelter with an opening large enough for several persons to pass through. The northeast-facing overhang has a smaller opening in its roof. It is this smaller hole that produces the attributes that may have been used as a calendar/clock.

Because of its location in the shelter's roof, a beam of sunlight can pass through this second hole and cast a spot onto the shelter's wall and floor. This spot of light travels from west to east as the sun moves across the sky. It also moves from north to south and back again as the Earth travels around the Sun. the west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.

The spot first appears and starts down the surface of the wall of the shelter at different times of the morning depending on the time of the year. The spot grows in size from its first appearance until its maximum size is achieved roughly at midday. It then continues its downward movement until it reaches a point where it jumps to the floor of the shelter. As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders. If a person is seated on a certain one of these rocks as the spot reaches it, the Sun can be viewed through the calendar hole. This occurs at different times in the afternoon depending on the time of year.

The word roughly is closest in meaning to __________.

A. harshly

B. uneasily

C. approximately

D. finally

#Mẫu giáo

1

DH

Dương Hoàn Anh

20 tháng 5 2018

C Roughly = approximately = xấp xỉ

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LQ

Lê Quỳnh Anh

6 tháng 9 2018

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questionsThe observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.The physical attributes of the...

Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

The observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.

The physical attributes of the site allow its use as a natural calendar/clock. The "hole" at Hole in the Rock is formed by two large overhanging rocks coming together at a point, creating a shelter with an opening large enough for several persons to pass through. The northeast-facing overhang has a smaller opening in its roof. It is this smaller hole that produces the attributes that may have been used as a calendar/clock.

Because of its location in the shelter's roof, a beam of sunlight can pass through this second hole and cast a spot onto the shelter's wall and floor. This spot of light travels from west to east as the sun moves across the sky. It also moves from north to south and back again as the Earth travels around the Sun. the west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.

The spot first appears and starts down the surface of the wall of the shelter at different times of the morning depending on the time of the year. The spot grows in size from its first appearance until its maximum size is achieved roughly at midday. It then continues its downward movement until it reaches a point where it jumps to the floor of the shelter. As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders. If a person is seated on a certain one of these rocks as the spot reaches it, the Sun can be viewed through the calendar hole. This occurs at different times in the afternoon depending on the time of year.

Which of the following can be inferred from the fourth paragraph?

A. The spot of light is largest when it first appears

B. The person seated on the rock cannot see the shelter.

C. The boulders are located below the rock shelter.

D. After it passes the boulders, the spot of light disappears.

#Mẫu giáo

1

DH

Dương Hoàn Anh

6 tháng 9 2018

C Đoạn cuối: “As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders.” = Khi mặt trời tiếp tục di chuyển sang phía tây, điểm sáng tiếp tục di chuyển qua sàn nhà và xuống đồi, tới những hòn đá cuội nhỏ.

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LQ

Lê Quỳnh Anh

9 tháng 6 2017

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questionsThe observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.The physical attributes of the...

Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

The observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.

The physical attributes of the site allow its use as a natural calendar/clock. The "hole" at Hole in the Rock is formed by two large overhanging rocks coming together at a point, creating a shelter with an opening large enough for several persons to pass through. The northeast-facing overhang has a smaller opening in its roof. It is this smaller hole that produces the attributes that may have been used as a calendar/clock.

Because of its location in the shelter's roof, a beam of sunlight can pass through this second hole and cast a spot onto the shelter's wall and floor. This spot of light travels from west to east as the sun moves across the sky. It also moves from north to south and back again as the Earth travels around the Sun. the west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.

The spot first appears and starts down the surface of the wall of the shelter at different times of the morning depending on the time of the year. The spot grows in size from its first appearance until its maximum size is achieved roughly at midday. It then continues its downward movement until it reaches a point where it jumps to the floor of the shelter. As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders. If a person is seated on a certain one of these rocks as the spot reaches it, the Sun can be viewed through the calendar hole. This occurs at different times in the afternoon depending on the time of year.

From which of the following can the time of year be determined?

A. The movement of the spot of light from west to east.

B. The speed with which the spot of light moves.

C. The movement of the spot of light from north to south.

D. The size of the sport of light at midday.

#Mẫu giáo

1

DH

Dương Hoàn Anh

9 tháng 6 2017

C Đoạn 3: “The west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.” = Chuyển động tây-đông có thể đã được dung để lập đồng hồ ngày, như một đồng hồ mặt trời, trong khi chuyển động bắc- nam có thể đã được dùng để tạo ra lịch theo mùa.

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