# SOLUTION: A motorboat goes 5 miles upstream in the same time it requires to 7 miles downstream. If the river flows at 2mph, find the speed of the boat in still water.

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 Click here to see ALL problems on Travel Word Problems Question 405406: A motorboat goes 5 miles upstream in the same time it requires to 7 miles downstream. If the river flows at 2mph, find the speed of the boat in still water.Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!let the speed of boat be x mph speed of current = 2mph .. upstream speed = x-2 mph downstream speed = x+2 mph .. Time = distance/speed time upstream time downstrea .. 5/(x-2)=7/(x+2) cross multiply 5(x+2)=7(x-2) 5x+10=7x-14 2x=24 /2 x=12 mph====> speed of boat