A 100 m long train is moving with a uniform velocity of 45 km/hr. The time taken by the train to cross a bridge of length 1 km is

The correct option is D 88 s

Length of train = 100 m

Velocity of train = 45 km/hr = $45\times \frac{5}{18}=12.5m/s$

Length of bridge = 1 km = 1000 m

$\therefore$ Total length covered by train = 1100 m.

Time taken by train to cross the bridge = $\frac{1100}{12.5}=88sec$