ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2020 Question 1

Question 1

A furnace wall made of steel plate 10 mmthick and thermal conductivity 15 keal/m-hr-$$^\circ C$$ is lined inside with silica brick of 150 mm thick of thermal conductivity 1.75 kcal/m-hr-$$^\circ C$$ and on with outside magnesia bricks of 200 mm thick with thermal conductivity of 4.5 kcal/m-hr-$$^\circ C$$. The total resistance of the composite wall will be

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