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A wall has two layers X and Y each made ...

A wall has two layers X and Y each made of different materials. Both layers have same thickness. Thermal conductivity of X is twice that of Y. At steady state the temperature difference of opposite faces of wall is `54°C`. The temperature difference across Y layer is

A

`18°C`

B

`27°C`

C

`0°C`

D

`36°C`

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