Boats and Streams Formulas

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 v km/hr, then:

Speed downstream =(u + v) km/hr.

Speed upstream = (uv) 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-div-1by2(a + b) km/hr.

Rate of stream =1-div-1by2(ab) km/hr.

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