16. A train moving at the rate of 36 km per hour crosses a standing man in 10 seconds. It will cross a platform 55 metres long in:

17. A train running at the speed of 45 kmph took 12 seconds in passing a certain point. Then the length of the train must be:

18. A train 100 metres long running at 36 kmph takes 25 seconds to pass a bridge. The length of the bridge is: