Heat Conduction question from JEE Main 2025 (22 Jan, Shift 1)

Three conductors of same length having thermal conductivity $k_1, k_2$ and $k_3$ are connected as shown in figure.

Area of cross sections of $1$st and $2$nd conductor are same and for $3$rd conductor it is double of the $1$st conductor. The temperatures are given in the figure. In steady state condition, the value of $\theta$ is _________ $^\circ\text{C}$. (Given: $k_1 = 60\text{ J s}^{-1}\text{ m}^{-1}\text{ K}^{-1},\ k_2 = 120\text{ J s}^{-1}\text{ m}^{-1}\text{ K}^{-1},\ k_3 = 135\text{ J s}^{-1}\text{ m}^{-1}\text{ K}^{-1}$)