The 700 mr ceiling of a building has a thermal resistance of 0.52 m2·K/W. The rate at which heat is lost through this ceiling on a cold winter day when the ambient temperature is - 10°C and the interior is at 20°C is
(a) 23.1 kW
(b) 40.4 kW
(c) 55.6 kW
(d) 68.1 kW
(e) 88.6 kW
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