The interface temperature Ti (in K) of the composite wall is _____________

Question

1. Heat transfer through a composite wall is shown in figure. Both the sections of the walls 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 _____________