Hi,

a motorboat traveled downstream in 1.5 hours with a 3 miles per hour current.  ON the way back against the same current the trip took 2 hours.

How fast was the boat traveling in still water?

D = rt, Distance Down and Back the same

   ***

            3.5hr(3mph) = .5r

                  21mph = r

CHECKING our answer***

     24mph(1.5hr) = 36mi =  18mph(2hr) =  

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