Two slabs A and B, each though similar, ...

Two slabs A and B, each though similar, in all other respects, have different materials. They are placed one above the other in perfect contact and a steady difference of temperature of `36^(@)C` is maintained across the combination. If the thermal conductivity of A is twice that of B, what is the temperature of interface ?

`16^(@)C`

`12^(@)C`

`28^(@)C`

`24^(@)C`

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