GRE Math Numeric Entry Question 174
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The Lirr River runs from Rosedale in the west to Oceanside in the east with the current moving at an average of 10 miles per hour. Sasha is traveling by motorboat from Oceanside to Rosedale and back. If the water were not moving, Sasha's motorboat would travel at an average speed of 20 miles per hour. Given the current, what was Sasha's actual average speed, in miles per hour, for the round trip?