Physics - Heat & Thermo Question with Solution | TestHub

Three conductors of same length having thermal conductivity ${\mathrm{k}}_1,{\mathrm{k}}_2$ and ${\mathrm{k}}_3$ are connected as shown in figure.
Area of cross sections of $1^{\text{st }}$ and $2^{\text{nd }}$ conductor are same and for $3^{\text{rd }}$ conductor it is double of the $1^{\text{st }}$ conductor. The temperatures are given in the figure. In steady state condition, the value of $\theta$ is _______ ${}^{\circ }\mathrm{C}$. (Given : ${\mathrm{k}}_1=60{\mathrm{Js}}^{-1}{\mathrm{m}}^{-1}{\mathrm{K}}^{-1},{\mathrm{k}}_2=120{\mathrm{Js}}^{-1}{\mathrm{m}}^{-1}{\mathrm{K}}^{-1},{\mathrm{k}}_3=135{\mathrm{Js}}^{-1}{\mathrm{m}}^{-1}{\mathrm{K}}^{-1}$ )