Q. Ice starts forming on the surface of lake and takes hours to form a layer of thick. How much time will it take to increase the thickness of layer to ?

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A

8 hours

B

Less than 8 hours

C

Between 8 to 16 hours

D

More than 16 hours

Solution:

Time taken in freezing a lake is directly proportional to the square of thickness of ice frozen so in this case thickness is getting doubled so total time will be hours and time to increase the layer thickness from to will be hours.

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