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Meg rowed her boat upstream a distance of 65 mi and then rowed back to the starting point. The total time of the trip was 18 hours. If the rate of the current was 4 mph, find the average speed of the boat relative to the water.
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let speed of boat be x time distance /velocity v up= x-4 v down= x+4 65/x-4 + 65/x+4 = 18 solve for x
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