Rbse | He Was Able To Swim

In a fixed time, a boy swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/h, then find the rate of swimming in still water.

If a person dives to the bottom of a swimming pool to pick up a coin, how would he feel as he swims toward the bottom ?

A man swimming in a stream which flows 1(1)/(2) km/hr finds that in a given time he can swim twice as far with the stream as he can against it. At what rate does he swim?