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The bridge is 1000 meters long. It takes one minute for a train to get on the bridge from the front to the rear. The time for the whole train to be completely on the bridge is 40 seconds
(1000+L)=60V,(1000-L)=40V
V=20m/s
L=200m
An express train is 180 meters long and passes through the tunnel at a constant speed. It takes 43 seconds from entering the tunnel to leaving completely. The time for the whole train in the tunnel is 23 seconds. How long is the tunnel?
Solving with the proportion equation
The tunnel is x m long
（x+180）：x=43：23
43x=23（x+180）
43x-23x=4140
x=207
A: the tunnel is 207 meters long
It takes 25 seconds for a train to pass through a 340 meter long tunnel and 43 seconds for it to pass through a 646 meter long bridge at the same speed
Let the length of the vehicle be x m and the speed be y m / s
(340+x)/25=(646+x)/43
X = 85 m
Y = (340 + 85) / 25 = 17 m / S
A: the speed of this train is 17 meters per second, and the length is 85 meters
PS: the distance of a train passing through a tunnel (bridge) is actually calculated from the beginning when the head of the train enters the tunnel (bridge) until the tail of the train leaves the tunnel (bridge). Therefore, the length of the tunnel (bridge) plus the length of the train itself is divided by the passing time to get the speed of the train
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