The temperature drop through each layer of a two layer furnace wall is shown in figure. Assume that the external temperature $T_1$ and $T_3$ are maintained constant and $T_1 > T_3$. If the thickness of the layers $x_1$ and $x_2$ are the same, which of the following statements are correct.
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$\frac{d Q}{d t}=K A \frac{d \theta}{d x 0}$
$\frac{d \theta}{d x}=$ slope of graph $\alpha \frac{1}{K}$
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