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29 tháng 3 2018

Xe khách đi hết 3 giờ 51 phút nha bạn 

9 tháng 4 2019

Mình chịu 😆... Ahii...? 

18 tháng 3 2021

gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg

18 tháng 8 2015

K ai giai dc ak?

 

 

20 tháng 3 2017

42 phút = 0.7 giờ

Tỉ số quãng đường đi cùng thời gian của xe Hai Âu so với xe khách lớn :

11 : 9 = 11/9

Thời gian xe khách lớn đi hết đoạn đường AB :

0,7 : ( 11 - 9)  x 11 = 3,85 giờ

3,85 giờ = 3 giờ 51 phút

a: 1h12' thì xe tải đi được 40*1,2=48(km)

Hiệu vận tốc là 60-40=20(km/h)

Thời gian hai xe gặp nhau là 48/20=2,4(h)

b: Chỗ hai xe gặp cách A:

48+2,4*40=144(km)

Sớm hơn : `450/y - 450/x = (450x-450y)/(xy) (h)` 

14 tháng 1 2018

Chọn đáp án D

1 tháng 10 2021

tóm tắt giúp mik vs nữa nha

1 tháng 10 2021

Tôi ko biết