一辆长1000米的火车以80km/h的速度穿过一个长5.5km的隧道,这辆火车需要多少时间才能完全穿过这个隧道?
应该是1
(5.5+1)/80=4.875min
英语翻译A train of length 1000 m entres a tunnel that is 5.5 km
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