BOATS AND STREAMS

Important facts:
1)In water, the direction along the stream is called down stream.
2)Direction against the stream is called upstream.
3)The speed of boat in still water is U km/hr and the speed of stream is V km/hr then
speed down stream =U + V km/hr
speed up stream = U - V km/hr
Formulas:
If the speed down stream is A km/hr and the speed up stream is B km/hr then
speed in still water = ½(A+B) km/hr
rate of stream =1/2(A-B) km/hr