Compare, l$.$e$.$; find the ratio of the rate of heat conduction through a $10\mathrm{.}0-$ cm $-$thick wall that has an area of $10\mathrm{.}0m^2$ and a thermal conductivity twice that of glass wool with the rate of heat conduction through a window that is $0\mathrm{.}750$ cm thick and that has an area of $2\mathrm{.}40m^2,$ assuming the same temperature difference across each.

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