It takes Joey the postman 1 hour to run a 3-mile long route every day. He delivers packages and then returns to the post

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It takes Joey the postman 1 hour to run a 3-mile long route every day. He delivers packages and then returns to the post office along the same path. If the average speed of the round trip is 5 miles/hour, what is the speed with which Joey returns?

A. 11
B. 12
C. 13
D. 14
E. 15

Answer: E

Source: GMAT Club Tests
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