In a 10 metre deep lake, the bottom is a...

In a 10 metre deep lake, the bottom is at a constant temperature of `4^(0)C`. The air temperature is constant at `-4^(0)C`. The thermal conductivity of ice is 3 times that of water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

7.5 m

6 m

5 m

2.5 m

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