The rate of flow of heat through a metal rod with temperature difference $40^{\circ} \mathrm{C}$ is $1600…
The rate of flow of heat through a metal rod with temperature difference $40^{\circ} \mathrm{C}$ is $1600 \mathrm{cal} / \mathrm{s}$. The thermal resistance of metal rod in ${ }^{\circ} \mathrm{C} \mathrm{s} / \mathrm{cal}$ is