The 35-cm-thick roof of a large room made of concrete (k = 0.79 W/m•ºC, α = 5.88×10-7 m2/s) is initially at a uniform temperature of 15ºC. After a heavy snow storm, the outer surface of the roof remains covered with snow at -5ºC. The roof temperature at 12 cm distance from the outer surface after a period of 2 hours is
(a) 13ºC
(b) 11ºC
(c) 7ºC
(d) 3ºC
(e) -5ºC
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