A hot reservoir at 50oC is connected to a cold reservoir at -60oC by a cylindrical, thermal conductor. The thermal conductor has a constant radius of 5 cm, but is made up of two different metals. The first portion of the conductor, made of aluminum, is 8 cm long and has a thermal conductivity of 205 W/mK and is in contact with the hot reservoir. The second portion of the conductor, made of brass, is 10 cm long and has a thermal conductivity of 109 W/mK, and is in contact with the cold reservoir. (a) What is the temperature at the junction between the aluminum and brass