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The distance covered by three cars are i...

The distance covered by three cars are in the ratio of `1:2:3` and the time taken is in the ratio of `3:2:1` Find the ratio of their speed ?

A

`3 : 9 : 1`

B

`1 : 3: 9`

C

`1 : 2 : 4`

D

`4 : 3 : 2`

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