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A block of ice at 0^(@)C rest on the upp...

A block of ice at `0^(@)C` rest on the upper surface of the slab of stone of area `3600cm^(2)` and thickness of `10cm`. The slab is exposed on the lower surface to steam at `100^(@)C`. If `4800g` of ice is melted in one hour, then calculate the thermal conductivity of stone.
(Given the latent heat of fusion of ice `=80cal//g`)

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