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A composite plane wall consists of a 3-in.-thick layer of insulation (ks = 0.029 Btu/h ft R) and a 0.75-in.-thick layer of siding (ks = 0.058 Btu/h ft R). The inner temperature of the insulation is 67F. The outer temperature of the siding is 8F. 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. Part A Your answer is incorrect. Try again. Determine at steady state the temperature at the interface of the two layers, in F. -.3333 T = the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work SHOW HINT OF Part B Determine the rate of heat transfer through the wall in Btu/h-ft2 of surface area. (-/-) = Btu/h-ft Attempts: 4 of 4 used