1. 1. Downstream/Upstream :
In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream.
2.If the speed of a boat in still water is u km/hr and the speed of the stream is vkm/hr, then:
Suppose a man covers a certain distance at x kmph and an equal distance at ykmph.
Suppose a man covers a certain distance at x kmph and an equal distance at ykmph.
3.3. If the speed downstream is a km/hr and the speed upstream is b km/hr, then:
