Question

A train takes 25 seconds to cross a signal which is at one end of the bridge of length 473 m. If the train takes 68 seconds to cross the bridge, then find the length of the train. (in metre)

Answer 1

The train takes time = 68 - 25 = 43s

Speed of train = 473/43 = 11m/s

Train takes cross bridge = 68 sec

Train length = x

473 + x = 68 * 11

473 + x = 748

x = 748 - 473 = 275m

Train length = 275m

Answer 2

Speed of train is,

v = 473 / 25 = 18.92 m/s

Let length of train be L. Total distance required for the train to cross the bridge is,

d = (L + 473) m

Time taken to cross the bridge is 68 seconds.

18.92 × 68 = L + 473

1286.56 = L + 473

L = 813.56 m