Arithmetic Aptitude :: Boats and Streams
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Downstream/Upstream:
In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream.
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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.
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If the speed downstream is a km/hr and the speed upstream is b km/hr, then:
speed in still water = \( \frac { 1 } { 2 } \) ( a+b )km/hr
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Rate of Stream = \( \frac { 1 } { 2 } \) ( a-b )km/hr