A person can row a motor boat in still water at the rate of 12 km/hr. It takes him thrice as long to row upstream of a river as to row downstream of the same river. The speed of the stream is :

A boat goes 24 km upstream in 4 hours and 32 km downstream in 4 hours. The speed of the boat in still water is:

Let the speed of a boat in still water be $u$ km/hr and the speed of the water current in a river be $v$ km/hr. If a man rows distance $D$ down stream and same distance upstream, then average speed of total journey is

A man rows 24 km upstream in 6 hours and 36 km downstream in 6 hours each time, then the speed of the boat in the still water is

A motorboat can row at the speed of 10 km/h in still water. If the river is flowing at 5 km/h, and it takes 20 hours for a round trip, then the distance between the two places is

A man rows 15 km upstream in 5 hours and 25 km downstream in 5 hours. The speed of the current is:

A swimmer whose speed in swimming pool is 5 km/h, swims between two points in a river and returns back to starting point. He took 20 minutes more to cover the distance upstream than to cover downstream. If the speed of stream is 2 km/h, then the distance between two points is