SOLUTION: Meg rowed her boat upstream a distance of 72 miles and then rowed back to the starting point. The total time of the trip was 18 hours. If the rate of the current was 3 mph, find th

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Meg rowed her boat upstream a distance of 72 miles and then rowed back to the starting point. The total time of the trip was 18 hours. If the rate of the current was 3 mph, find th      Log On

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Question 898218: Meg rowed her boat upstream a distance of 72 miles and then rowed back to the starting point. The total time of the trip was 18 hours. If the rate of the current was 3 mph, find the average speed of the boat relative to the water.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
______________speed________time_______distance
UP____________r-3__________(___)_______72
DOWN__________r+3__________(___)_______72


______________speed________time_______distance
UP____________r-3__________72/(r-3)_______72
DOWN__________r+3__________72/(r+3)_______72
Total_______________________18