Heat And Thermodynamics

The temperature difference bewtween two sides of metal plate, \(3 \mathrm{~cm}\) thick is \(15^{\circ} \mathrm{C}\). Heat is transmitted through plate at the rate of \(900 \mathrm{~kcal}\) per minute per \(\mathrm{m}^2\) at steady state. The thermal conductivity of metal is