问一道英语奥数题A 120-meter train is gong to pass a tunnel.At 10:00

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问一道英语奥数题
A 120-meter train is gong to pass a tunnel.At 10:00 its head reaches one end of the tunnel and at 10:04 half part of the train still remains inside the tunnel.We know the speed of the train is 120km/h.so the length of the tunnel is ___m.

解,设隧道长x米,则(x+60)/（4*60）m/s=120km/h=100/3m/s,得x=7940米
翻译：一列长120米的列车通过一个隧道.在10点时头部刚到达隧道,10点零4分时火车还有一半在隧道里.已知火车速度为120km/h,求隧道长度多少米?

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