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英语翻译A train of length 1000 m entres a tunnel that is 5.5 km

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英语翻译
A train of length 1000 m entres a tunnel that is 5.5 km long.It is travelling at an average speed of 80 km/h.How long does it take the train to completely pass through the tunnel?
长了点,
选择1 4min 52.5s
2 4min 82.5s
3 41/8 min
4 5.625 min
英语翻译A train of length 1000 m entres a tunnel that is 5.5 km
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