19. A train 75 metres long is running with a speed of 20 km/hr. It will pass a standing man in:

20. A train is running at the rate of 40 kmph. A man also is going in the same direction parallel to the train at the speed of 25 kmph. If the train crosses the man in 48 seconds, the length of the train is:

21. A train 100 metres long travels at 70 km per hour. A man is running at 10 km per hour in the same direction in which the train is going. The train will pass the man in: