A train passes over a 400 m long bridge. If the speed of the train is 30 m/s and the train takes 20 s to cross the bridge, find the length of the train :

Foundation

Physics Foundation

Speed Velocity and Acceleration

Question

600 m

800 m

200 m

400 m

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Bridge length = 400 m, speed of train = 30 m/s, time taken = 20 second

let the length of train = L

Now time taken to cross bridge = $\frac{Total length(Bridge length + Train length )}{velocity} = \frac{400 + L}{30}$

$20 = \frac{400 + L}{30}$

L = 200 m.