Heat is lost through a brick wall (k = 0.72 W/m•ºC), which is 4 m long, 3 m wide, and 25 cm thick at a rate of 500 W. If the inner surface of the wall is at 22ºC, the temperature at the midplane of the wall is
(a) 0ºC
(b) 7.5ºC
(c) 11.0ºC
(d) 14.8ºC
(e) 22ºC
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