Consider two walls, A and B, with the same surface ar- eas and the same temperature drops across their thicknesses. The ratio of thermal conductivities is kA/kB = 4 and the ratio of the wall thicknesses is LA/LB = 2. The ratio of heat transfer rates through the walls QAIQB is
(a) 0.5
(b) 1
(c) 2
(d) 4
(e) 8
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