A steel pipe (k = 45.0 W/m-K) having a 0.05m O.D is covered with a 0.042 m thick layer of magnesia (k = 0.07W/m-K) which in turn covered with a 0.024 m layer of fiberglass insulation (k = 0.048 W/m-K). The pipe wall outside temperature is 370 K and the outer surface temperature of the fiberglass is 305 K. What is the interfacial temperature between the magnesia and fiberglass?

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