**BOATS AND STREAMS**

**1.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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