Important Facts and Formulae

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 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 : 

Multiple Type Question & Answers