1 . The 20"-diameter wheels of a car rotates at rate of 24 revolutions per minute, while the 30"-diameter wheels of another car travels at a rate of 18 revolutions per minute. What is the ratio of the speed of the second car to that of the first?
- A. 4 : 3
- B. 6 : 5
- C. 9 : 8
- D. 1 : 1
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