Two planets A and B have thermal conduct...

Two planets A and B have thermal conductivities `84Wm^(-1)K^(-1)` and `126 Wm^(-1)K^(-1)` respectively They have same surface area and same thickness. They are placed in contact along their surface .If the temperatures of the outer surface of A and B are kept at `100 ^@C ` and `0^@C` respectively , then the temperature of the surface of contect in steady state is ___^@C

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