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

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) (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
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