# 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 ?

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 ?

A. 355 mtrs

B. 325 mtrs

C. 365 mtrs

D. 312 mtrs

**Answer : **A. 355 mtrs

## Explanation :

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.