The walls of a food storage facility are made of a 2-cm-thick layer of wood (k = 0.1 W/m•K) in contact with a 5-cm-thick layer of polyurethane foam (k = 0.03 W/m•K). If the temperature of the surface of the wood is -10oC and the temperature of the surface of the polyurethane foam is 20oC, the temperature of the surface where the two layers are in contact is
(a) -7oC
(b) -2oC
(c) 3oC
(d) 8oC
(e) 11°C
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