Boat and Streams Important Formulas:

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Boat and Streams Important 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 = (u – v) km/hr.
3. If the speed downstream is a km/hr and the speed upstream is b km/hr, then:

Speed in still water = 1/2(a + b) km/hr.
                                                  Rate of stream = 1/2(a – b) km/hr.

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