- 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
Boats and Streams - Important Formulas |
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