A man walks 30 minutes at an average speed of 3 miles/hour. He waits 10 minutes for a bus, which bring him back to his starting point at 3:15. If he began his walk at 2:25 the same afternoon, find the average speed of the bus?
A. 1.5 mph
B. 3 mph
C. 6 mph
D. 9 mph
সঠিক উত্তরঃ
D.
9 mph
Explanation:
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