Two plates with the same area A are placed in contact with each other as shown in the figure. The plates have thickness x1 and x2 and thermal conductivity k1 and k2. Heat is passed from left to right through the plates from a high temperature range T1 to a low temperature range T2. The temperature of the plates' contact surface is Tm, on the flat side to the far left T1 and the flat side to the far right T2, see the figure.
Find Tm expressed by T1, T2 and the other sizes given in the task.
Explain.
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