Đáp án:
`text{→A.850m/phút}`
Giải thích các bước giải:
`text{Đổi:1 giờ=60 phút}`
`text{51km=51 000m}`
Ô tô đó đi với vận tốc:
`51 000:60=850(m``/``phút)`
Đáp số:`text{850m/phút}`
Đáp án:A
51km = 51000 m
1h = 60 phút
=> 51 km/ h = 51000 / 60 m/phút = 850 m/phút
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