Boats and Streams – Important Formulas

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Boats and Streams – Important Formulas

Downstream/Upstream:
In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream.
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.
If the speed downstream is a km/hr and the speed upstream is b km/hr, then:

Speed in still water = 1 (a + b) km/hr.

2

Rate of stream = 1 (a – b) km/hr.

2

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