A 120m long train is moving towards west at a speed of 10m/s. A small bird flying towards east with a speed of 5m/s crosses the train. Find the time taken by the bird to cross the train in second???
a train is moving towards east with a speed of 20m/s . A person is running on the roof of the train with a speed 3m/s against the motion of train . Velocity of the person as seen by an observer on ground will be-
Ans is 17m/s towards east..how?