Find the length of a tunnel which a man travelling by train can cross in 4 minutes. The speed of the train is 36 km per hour.

The wheels of the locomotive of a train are 2.1 m in radius. They make 75 revolutions in one minute. Find the speed of the train in km per hour.

A train travels (1445)/(2) km in (17)/(2) hours. Find the speed of the train in km/h.

A train travelling at 90 km/h crosses a pole in 8 s. Find the length of the train (in m).

A train travels with a speed of 20 m/s in the first 10 minutes, goes 8.5 km in the next 10 minutes, 11 km in the next 10,8.5 km in the next 10 and 6 km in the next 10 minutes. What is the average speed of the train in kilometer per hour for the journey described?

Excluding stoppages, the speed of a train is 45 km/h and including stoppages, it is 36 km/h. For how many minutes does the train stop per hour ?