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The slab shown in the figure consists of...

The slab shown in the figure consists of two parallel layers of cooper anb brass of same thickness and having thermal conductivites in the ratio ` 4 : 1`. IF the free face of the brass is at `100^(@)C` and that of copper is at `0^(@)C `, then the temperature of the interface will be

A

`20^(@)C `

B

`30^(@)C `

C

`40^(@)C `

D

`25^(@)C `

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The correct Answer is:
A
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