The inner wall of a furnace is at a temperature of `700^circ`C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.`circ`C-1 respectively. The ambient air is at `30^circ`C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.`circ`C-1. The rate of heat loss from the outer surface in W.m-2is
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