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A girl rode her bicycle from home to school, a distance of 15 miles, at an average speed of 15 miles per hour. She returned home from school by walking at an average speed of 5 miles per hour. What was her average speed for the round trip if she took the same route in both directions?
A8.5 miles/hr.
B7 miles/hr.
C7.5 miles/hr.
DNone of these
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