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


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