A heat conducting rod, 1.1 m long, is made of an aluminum section that is 0.8 m long, and a copper section that is 0.3 m long. Both sections have cross-sectional areas of 0.00040 m2. The aluminum end is maintained at a temperature of 40°C and the copper end is at 190°C. The thermal conductivity of aluminum is 205 W/m·K and of copper is 385 W/m·K. Steady state has been reached, and no heat is lost through the well-insulated sides of the rod. The temperature of the aluminum-copper junction in the rod is closest to how many degrees in Celcius?