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2024-01-26 20:07:59
chập
2024-01-26 19:57:01
Giải
1km bác ba đạp đc số phút là:
20 : 4 = 5 (phút)
vậy 12km bác ba đạp đc số phút là:
12 x 5 = 60 (phút)
ĐS: 60 phút