# GATE Mechanical 2014 Set 3 | Question: 44

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Heat transfer through a composite wall is shown in figure. Both the sections of the wall have equal thickness $(l)$. The conductivity of one section is $k$ and that of the other is $2k$. The left face of the wall is at $600$ $K$ and the right face is at $300$ $K$.

The interface temperature $T_i$ (in $K$) of the composite wall is _______

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