Jeff takes 20 minutes to jog around the race course one sme, and 25 minutes to jog around a second time. What is his average speed in miles per hour for the whole jog if the course it 3 miles long?
A. 6
B. 8
C. 10
D. 12
E. 14
সঠিক উত্তরঃ
B.
8
Explanation:
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