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Greg is training for a marathon by running to and from work each day, a distance of 12 miles each way. He runs from home to work at an average speed of 6 miles per hour and returns at an average speed of 4 miles per hour. What is Greg’s average speed, in miles per hour, for the round trip?
A. 5.5
B. 5.0
C. 4.8
D. 2.5
E. 2.4
Answer: C
Source: Princeton Review
A. 5.5
B. 5.0
C. 4.8
D. 2.5
E. 2.4
Answer: C
Source: Princeton Review
