A body takes 5 minutes to cool from 90^(...

A body takes 5 minutes to cool from `90^(@)C` to `60^(@)C` . If the temperature of the surroundings is `20^(@)C` , the time taken by it to cool from `60^(@)C` to `30^(@)C` will be.

A

5 min

B

8 min

C

11 min

D

12 min

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The correct Answer is:

C

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