Quantitative apptitude formulas - ( BOATS AND STREAMS )

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