Question

A train 100 m in length is moving with a velocity of 54 km/h in one direction another train 80 m in length is moving with a velocity of 36 km/h in the opposite direction find the time when two trains will completely cross each other

Answer 1

here Va velocity of first train=54km/h

Vb velocity of second train=36km/h

relative velocity is

Vab=Va+Vb

54+36=90km/h=25m/s

distance=100+80=180m

velocity=distance/time

time=distance/velocity

time=180/25=7.2sec

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