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On a cold winter day, the atmospheric temperature is - (on Celsius scale) which is below 0C. A cylindrical drum of height h made

On a cold winter day, the atmospheric temperature is - (on Celsius scale) which is below 0C. A cylindrical drum of height h made of a bad conductor is completely filled with water at 0C and is kept outside without any lid. Calculate the time taken for the whole mass of water to freeze. Thermal conductivity of ice is K and its latent heat of fusion is L. Neglect expansion of water on freezing.

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