Two metal plates are soldered together as shown in Fig. 19-2. It is known that A = 80 cm2, L1 = L2 = 3.0 mm, T1 = 100 °C, T2 = 0 °C. For the plate on the left, kT1 = 48.1 W/m·K; for the plate on the right kT2 = 68.2 W/m·K. Find the heat flow rate through the plates and the temperature T of the soldered junction.