BOATS AND STREAMS --

These are the important formulas for the Boats and Stream problems

I. In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream.

II. If the speed of a boat in still water is u km/ht and the speed of the stream is v km/hr, then :
Speed downstream = (u + v) km/hr
Speed upstream (u - v) km/hr.

III. If the speed downstream is a km/hr and the speed upstream is b km/hr, then :
Speed in strill water = 1/2 (a + b) km/hr
Rate of stream = 1/2 (a - b) km/hr

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