physics
posted by Maihul .
A 200m long train crosses a 400m long bridge with a speed of 36km/hr . Calculate the time taken by train to cross the bridge? plz give me the answer with explaination

The speed of the train is v = 36 km/h =36000/3600=10 m/s,
L is the length of the train,
S is the length of the bridge.
The time of passing the bridge begins when head end of the train enters the bridge and ends when its rear end leaves the bridge, therefore, the distance is s=L+S=200+400=600 m
t=s/v =600/10=60s 
speed of the train(v)=36km/h
=36*5/18
=10m/s
let L be the length of the train
and S be the length of bridge
Therefore, distance(s)=L+S
=200+400
=600m
time(t)=s/v
=600/10
=60s ans.