A goods train leaves as station at a certain time and at a fixed speed. After 6 hours an express train leaves the same station and moves in the same direction at a uniform speed of 90 kmph. This train catches up the goods train in 4 hour. Find the speed of the goods train.

A train leaves from a station and moves at 40 km/hr. After 2 hours, another train leaves from the same station and moves in the same direction at a certain speed. If the second train catches up with the first train in 4 hours, what is the speed of the second train? Options are (a) 55 km/hr (b) 50 km/hr (c) 60 km/hr (d) 65 km/hr .

Without stopping the speed of the train is 120 kmph , with stopping the speed of the train is 80 kmph . Find the stop time of the train ?