Length of the train is 170 meters and speed of the train is 63 km/hour. This train can pass a bridge in 30 seconds, then find the length of the bridge ?

Given speed = 63 km/hr = 63 × 5/18 = 35/2 m/s
Let the length of the bridge = x mts
Given time taken to cover the distance of (170 + x)mts is 30 sec.
We know speed = distance/time
35 / 2 = ( 170 + x ) / 30
x = 355 mts.