Question

A 50 meter long train is moving with a uniform velocity of 45km/hr.The time taken by the train to cross a bridge of length 850 meters is

Answer 1

A 50 meter long train would take 17 minutes to cross 850 meters bridge

Answer 2

Solution:-
45km/h=12.5 m/s

Total length =850m+150m=1000m

Velocity=Displacement/Time

We can write,
t=s/v
$t = \frac{1000}{12.5} \\ t = 80s$
Hence,
The time taken to cross the bridge is 80s.