Problems on Trains - General Questions

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?

A train 110 m long crosses a platform 670 m long in 39 seconds. What is the speed of the train?

A train 170 m long passes a man running at 6 km/hr in the same direction in 17 seconds. What is the speed of the train?

Two trains of lengths 220 m and 235 m run on parallel lines in the same direction at 99 km/hr and 36 km/hr. How long does the faster train take to pass the slower one completely?

Two trains of lengths 260 m and 365 m run on parallel lines in the same direction at 63 km/hr and 18 km/hr. How long does the faster train take to pass the slower one completely?