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Part of 2012 Math Prize For Girls Problems

Problems(1)

Math Prize 2012 Problem 1

Source:

9/24/2012
In the morning, Esther biked from home to school at an average speed of xx miles per hour. In the afternoon, having lent her bike to a friend, Esther walked back home along the same route at an average speed of 3 miles per hour. Her average speed for the round trip was 5 miles per hour. What is the value of xx?