Question

a train of 150m in length going towards north at a speed of 10m/s.A bird is flying at 5m/s parallel to the track toward south.the time taken by bird to cross the train

Answer 1

the relative velocity of bird with respect to the train is 15m/s so time taken by the bird to cross the train is 10 second

Answer 2

Time = Relative Distance / Relative Velocity
= (150 m) / (10 m/s + 5 m/s)
= 10 s

∴ Bird will cross the train completely in 10 seconds