13. A 150 metre long train crosses a man walking at the speed of 6 kmph in the opposite direction in 6 seconds. The speed of the train in km/hr is:

14. A train of length 150 metres takes 10 seconds to pass over another train 100 metres long coming from the opposite direction. If the speed of the first train be 30 kmph, the speed of the second train is:

15. A speed of 16 metres per second is the same as