Problems on Trains - General Questions

A train 100 m long crosses a platform 640 m long in 37 seconds. What is the speed of the train?

Two trains 90 m and 540 m long are running in opposite directions on parallel tracks at 27 km/hr and 135 km/hr. In how much time will they cross each other completely?

A train passes a station platform in 37 seconds and a man standing on the platform in 19 seconds. If the speed of the train is 57.6 km/hr, what is the length of the platform?

A train 70 m long crosses a platform 830 m long in 30 seconds. What is the speed of the train?

A train 100 m long passes a man running at 4 km/hr in the same direction in 20 seconds. What is the speed of the train?