Question

120 metre long train is moving towards west with a speed of 10 metre per second a bird flying towards east with a speed of 15 metre per second processing the time taken by the bird to cross the train will be

Answer 1

Time = Distance / Relative Velocity
= 120 / (10 + 15)
= 120 / 25
= 4.8 seconds

Time taken by bird to cross the train is 4.8 seconds.

Answer 2

Hi !

Relative velocity = 10 + 15 = 25 m/s

Distance = 120

Time = Distance/Relative velocity
         = 120/25
         = 4.8 sec