A composite plane wall consists of a 5-in.-thick layer of insulation (ks = 0.029 Btu/h ft. "R) and a 0.75-in.-thick layer of siding (k, = 0.058 Btu/h-ft-°R). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 0°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft² of surface area.

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