A man rows a boat such that it covers a distance upstream in twice the time taken by him to cover the same distance downstream. If the speed of stream is 5 km/h, the speed of boat in still water is:

A motorboat can travel 10 km against the stream in 30 minutes and returns back at the same point in 10 minutes. The speed of the stream is,

A can run 22.5 m while B runs 25 m in the same time. In a 1000 m race, by how much distance B beats A?

The speed of a boat in still water is 12 km/hr. It takes twice as long to go upstream to a point as to return downstream to the starting point, then the speed of the stream is :

A runs four times as fast as B. If A gives B a start of 90 meters, how far must the goal on the race course be so that A and B reach it at the same time ?

The ratio of the speed of a motorboat and that of the current of water is 14 : 8. The boat goes a certain distance along with the current in 3 hours 12 minutes. How much time does it take to come back?

In a 600 m race, A beats B by 37.5 m or by 10 seconds, then the time taken by B to finish the race is