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 −10°C and the temperature of the surface of the polyurethane foam is 20°C, the temperature of the surface where the two layers are in contact is
(a) –7°C
(b) –2°C
(c) 3°C
(d) 8°C
(e) 110C
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