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- 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: | |||||||
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| 3. | If the speed downstream is a km/hr and the speed upstream is b km/hr, then: | |||||||
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