Consider a composite wall consisting of four different materials as shown in Figure 4.15. Assuming one-dimensional heat flow, determine the heat flow through the composite slab and the interfacial temperatures. \(k_{A}=200 \mathrm{~W} / \mathrm{m}^{\circ} \mathrm{C}, k_{b}=20 \mathrm{~W} / \mathrm{m}^{\circ} \mathrm{C}\) and \(k_{C}=40 \mathrm{~W} / \mathrm{m}^{\circ} \mathrm{C}\) and \(k_{D}=60 \mathrm{~W} / \mathrm{m}^{\circ} \mathrm{C}\). Assume areas of surfaces \(B\) and \(C\) are equal to \(0.1 \mathrm{~m}^{2}\). All side surfaces are insulated.

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220 C B C D 2 cm 5 cm 3 cm 20C Area = 0.22 m.