- In water, If the boat moves against the stream then it is called Upstream.
- In water, If the boat moves with the stream, then it is called Downstream.
- Let , the speed of a boat in still water be u km/hr and the speed of the stream be v km/hr, then
Upstream Speed = ( u - v ) km/hr
Downstream Speed = ( u + v ) km/hr
- Let , the speed of a boat downstream is a km/hr and the speed of the boat upstream is b km/hr , then
Speed in still water = $\frac{1}{2}(a+b)$ km/hr
Rate of stream = $\frac{1}{2}(a-b)$ km/hr
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