ThePrismSolutions
1.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:
speed downstream=(u+v)km/hr.
speed upstream=(uv)km/hr.
3.If the speed downstream is a km/hr and the speed upstream is b km/hr,then :
speed in still water=1/2(a+b)km/hr
rate of stream=1/2(ab)km/hr

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