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Ice starts forming on a lake with water ...

Ice starts forming on a lake with water at `0^(@)C`, when the atmospheric temperature is `-6^(@)C`. If the time taken for 1 cm of Ice to be formed is 5 hours, then time taken for thickness of ice to change from 1 cm to 2 cm is

A

20 Hr.

B

10 Hr.

C

15 Hr.

D

25 Hr.

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The correct Answer is:
C
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