A partition wall has two layers A and B, in contact, each made of a different material. They have the same thickness but the thermal conductivity of layer A is twice that of layer B. If the steady state, temperature difference across the wall is 60 K, then the corresponding difference across the layer A is

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A partition wall has two layers A and B, in contact, each made of a different material. They have the same thickness but the thermal conductivity of layer A is twice that of layer B. If the steady state, temperature difference across the wall is 60 K, then the corresponding difference across the layer A is