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A wall consists of two layer, one of thi...

A wall consists of two layer, one of thickness 3 cm and other of 6 cm. the thermal conductivities of the materials of these layers are K and 3K respectively. The temperature of the outer surfaces of the two layers are `-5^(@)C` and `20^(@)C` respectively. determine the temperature of the surface of contact of the two layers in the steady state.

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