A train covers a distance of 180 km.in four hours. Another train covers the same distance in one hour less. The difference in distance in k.m. covered by these trains in one hour is:

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/ hr respectively in opposite direction on parallel tracks. The time (in second) which they take to cross each other is?

A train 100 metres long crosses a signal post in 5 seconds. How much time will it take to cross a bridge of length 200 metres with the same speed ? 

A train of length 150 meters took 8 seconds to cross a bridge of length 250 meters. Time taken by the train to cross a telephone post is :

A train of length 100 m runs at a speed of 120 km/h from north to south. Another train of length 150 m travels with a speed of 80 km from south to North . What is the time required to cross each other?

A train crossed a platform in 43 seconds. The length of the train is 170 metres. What is the speed of the train?