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1. |
The distance traveled by three cars in the ratio of 1: 2: 3. If the travel time ratio is 3: 2: 1, what is the ratio of their speed? |
A. | 3 : 9 : 1 |
B. | 1 : 3: 9 |
C. | 1 : 2 : 4 |
D. | 4 : 3 : 2 |
Answer» C. 1 : 2 : 4 | |