1 . Downstream/Upstream :
In water, the direction along the stream is calleddownstream.
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 v km/hr, then
Speed downstream = (u + v) km/hr.
Speed upstream = (u – v) km/hr.
3. If the speed downstream is a km/hr and the speed upstream is b km/hr, then
Speed in still water = 1⁄2 (a + b) km/hr.
Rate of stream = 1⁄2 (a – b) km/hr.
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