Boats and Streams
- Downstream/Upstream: In water, the direction along the stream is calleddownstream. And, the direction against the stream is calledupstream.
- If the speed of a boat in still water isukm/hr and the speed of the stream isvkm/hr, then: Speed downstream = (u+v) km/hr. Speed upstream = (u-v) km/hr.
- If the speed downstream isakm/hr and the speed upstream isbkm/hr, then:
Speed in still water = 1 (a+b) km/hr. 2 Rate of stream = 1 (a-b) km/hr. 2
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