SOLUTION: A motorboat went 50 miles in 4 hours when traveling at full speed upstream on river whose current flows at the rate of 7miles per hour.How fast can the boat travel in still water?
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Question 654953: A motorboat went 50 miles in 4 hours when traveling at full speed upstream on river whose current flows at the rate of 7miles per hour.How fast can the boat travel in still water? Answer by checkley79(3341) (Show Source):
You can put this solution on YOUR website! D=RT
50=(R-7)4
50=4R-28
4R=50+28
4R=78
R=78/4
R=19.5 MPH IS THE SPED OF THE BOAT IN CALM WATERS.
PROOF:
50=(19.5-7)4
50=12.5*4
50=50
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