Boat and stream part 1

1.Down stream/Up stream
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 = (u - v) 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(a - b) km/hr.

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