Question

a train hundred metre long is to cross a river of bridge of length 800 metre what time will it take to cross the bridge the train moves with a constant velocity of 36 kilometre per hour

Answer 1

total distance to cover=length of train+length of bridge=100+800=900m
velocity of the train=36kmph=10m/s
time taken to cross the bridge=900/10=90s

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Answer 2

Total distance required for the train to cross the bridge is,

d = (100 + 800) m = 900 m

The speed of the train is,

v = 36 km/h = 36 × 5 / 18 = 10 m/s

Hence the time taken to cross the bridge is,

t = 900 / 10 = 90 s.