BOATS AND STREAMS -> IMPORTANT FACTS AND FORMULA

I. In water, the direction along the stream is called
downstream.
And, the direction against the stream is called upstream.
II. 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.
III. 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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