A wall is made of brick, of thermal conductivity 1.0 kW/m-K, 230 mm thick, lined on the inner face with plaster of thermal conductivity 0.4 W/m-K and of thickness 10 mm. If the temperature difference of 30K is maintained between the two outer faces, what is the heat flow per unit area of wall? A. 110 W B. 119 W C. 129 W D. 140 W

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