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

A.10
B.12
C.20
D.22
Answer and Feedback
Answer:D
Feedback: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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