Boats and Streams - Important Formulas

1. Downstream/Upstream:
   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 vkm/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	(a + b) km/hr.
   	2

   
   
   

   Rate of stream =	1	(a - b) km/hr.
   	2

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Posted in: Aptitude