Question

A train 50m long passes over a bridge at a velocity of 30 km/h. If it takes 36 s to cross the bridge, the length of the bridge will be

Answer 1

Velocity $v=30km/h=30\times \frac{5}{18}=8.3m/s$

Time taken to cross $t=36s$

Let the length of bridge be $L$.

Distance covered by train to cross $d=50+L$

So, $L+50=36\times 8.3$

$⟹L\approx 250m$