1. The problem statement, all variables and given/known data The thermal conductivity of copper is 4 times that of brass.Two rods of copper and brass having same length and cross section are joined end to end. The free end of copper is at 0 degree C and the free end of brass is at 100 degree C. The temperature at the junction is? 2. Relevant equations I don't know what equation to use. R= r l/A? Or thermal conductance = kl/A where k is the thermal conductivity? Or is it something else?