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1. A tube 80 mm OD is insulated with a 60 mm layer of silica foam, for which the conductivity is 0.055W/m.C followed with a 40 mm layer of cork with a conductivity of 0.05 W/m.C. If the temperature of the outer surface of the pipe is 150C and the temperature of the outer surface of the cork is 30C, Calculate the heat loss per meter of length. [8]