Length of train is 170 meters and speed of 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 =  $63\times \frac{5}{18}=\frac{35}{2}$ 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 =  $\frac{dis\tan ce}{time}$m/s

$\Rightarrow \frac{35}{2}=\frac{170+x}{30}$

 -->  x = 355 mts.