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1. A 10 cm thick block of ice with a temperature of 0 C lies on the upper surface of 2400 cm2 slab of stone.

1. A 10 cm thick block of ice with a temperature of 0 C lies on the upper surface of 2400 cm2 slab of stone. The slab is steam-exposed on the lower surface at a temperature of 100 C. Find the heat conductivity of the stone if 4000 g of ice is melted in one hour given that the latent heat of fusion of ice is 80 cal g.

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