Fewpal
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In a stream running at 2 kmph,a motar boat goes 6km upstream and back again to the starting point in 33 minutes.find the speed of the motar boat in still water.

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Let the speed of the motarboat in still water be x kmph.then, 

6/x+2 +6/x-2=33/60 

11x2 -240x-44=0 

11x2 -242x+2x-44=0 

(x-22)(11x+2)=0 

x=22.

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