BOATS & STREAMS
If the speed of water is 'W' and speed of a boat in still water is 'B'
- Speed of the boat downstream is B+W
- Speed of the boat upstream is B-W
The direction along the stream is called downstream. And, the direction against the stream is called upstream.
If the speed of the boat downstream is x km/hr and the speed of the boat upstream is y km/hr, then
Speed of boat in still water= $$\dfrac{x+y}{2}$$ km/hr
Speed of stream= $$\dfrac{x-y}{2}$$ km/hr
