Question

A train 100m long is moving with a constant velocity of 72km/hr.find the time it takes to cross the bridge 1km long

Answer 1

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

d = (100 + 1000) m = 1100 m

The speed of the train is,

v = 72 km/h = 72 × 5 / 18 = 20 m/s

Hence the time taken to cross the bridge is,

t = 1100 / 20 = 55 s.