A slab consists of two parallel layers o...

A slab consists of two parallel layers of copper and brass of the same thichness and having thermal conductivities in the ratio `1:4` If the free face of brass is at `100^(@)C` anf that of copper at `0^(@)C` the temperature of interface is .

`80^@C`

`20^@C`

`60^@C`

`40^@C`

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