## Arithmatical - Boat’s and Streams

*Important Facts and Formulae*

1. |
In water, the direction along the stream is called The direction against the stream is called |
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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. |
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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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