1 . A man walks down the road for half an hour at an average speed of 3 miles per hour. He waits 10 minutes for a bus, which him back to his starting point at 3 : 15. If the man began his walk at 2 : 25 the same afternoon, what was the average speed of the bus?
- A. 3 mph
- B. 4.5 mph
- C. 6 mph
- D. 9 mph
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