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Calculate the rate of increment of the thickness of the layer of ice on a lake when the thickness of is `20cm` and the air temperature is `-40^(@)C`. Thermal conductivity of ice `=1.68Ks^(-1)m^(-1)K^(-1)` , density of ice `920kgm^(-3)` and latent heat capacity of ice `=336xx10^(3)Jkg^(-1)K^(-1)`.

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