A 60 cm long steel rod with a diameter of 4 cm is mated to a 40 cm long Cu rod with the same diameter. the unmated end of the steel rod( not at the interface) is connected to a 140 degrees C heat source, while the far end of the Cu( not at the interface) is connected to a 20 degrees C heat source. when the rod reaches a steady state, what is the temperature at the steel Cu surface and heat rate through the rod