solve this word problem upstream downstream
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=》》conept of upstream and downstream
Downstream/Upstream:
In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream.
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 = (u - v) km/hr.
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× (a - b) km/hr.
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