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 tunn

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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 tunn
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.

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 tunn
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?

x+60=120*4
X=420.
长420米。

翻译成中文就是：一条长为120米的火车正要通过一条隧道。10：00车头达到隧道口，10:04半截火车开出隧道口而另半截还在隧道里。我们知道火车速度为120km/h。问隧道长。
按车头来算，4分钟通过的路程为120*1/15=8km,这段路程还需减去车开出去的半截才算是隧道长，故8-0.06km=7.94km,即隧道长为7.94km...

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翻译成中文就是：一条长为120米的火车正要通过一条隧道。10：00车头达到隧道口，10:04半截火车开出隧道口而另半截还在隧道里。我们知道火车速度为120km/h。问隧道长。
按车头来算，4分钟通过的路程为120*1/15=8km,这段路程还需减去车开出去的半截才算是隧道长，故8-0.06km=7.94km,即隧道长为7.94km

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7940米
先把列车的时速换算成m/m（每分钟多少米）的形式：
120km/h约等于2000m/m
那么火车头在4（10：04-10：00）分钟中的行程为：
2000*4
在4分钟内，火车行驶过了隧道长度加上火车一半的长度，所以隧道长度等于
2000*4-60
为7940米

题干：一列120米长的火车过隧道。十点钟的时候火车头刚好进入隧道，十点零四分火车半个车身仍旧在隧道里。一直火车时速120km/h，求隧道长度。
我数学不大好，不知道对不对啊
你自己画两个图看看，假设隧道长度是x。四分钟的时间，也就是240秒钟。火车走过的长度应该是x+60。火车速度为120km/h，换算成秒是每秒100/3m。（100/3）*240=x+60
x=7940m...

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题干：一列120米长的火车过隧道。十点钟的时候火车头刚好进入隧道，十点零四分火车半个车身仍旧在隧道里。一直火车时速120km/h，求隧道长度。
我数学不大好，不知道对不对啊
你自己画两个图看看，假设隧道长度是x。四分钟的时间，也就是240秒钟。火车走过的长度应该是x+60。火车速度为120km/h，换算成秒是每秒100/3m。（100/3）*240=x+60
x=7940m

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