Need help practice problem

Q4) Two rods, one of aluminum and the other of copper are joined end to end. Both rods have the same diameter. The length of the Aluminum rod is 4 cm, and the length of the copper rod is 12 cm. The free end ofthe aluminum rod is kept at 300 0C, and the free end of the copper rod is kept at 20 C. (kAl = 200 J/(s - m -C), kCu =380 J/(s - m -C)) (a) Calculate the temperature at the aluminumcopper interface (between the two rods). (b) If 1x105 J of heat is conducted between the free end of aluminum and the free end of copper through the two rods in 10 minutes. Calculate the diameter of each rod. 0) With the rods reversed (now the free end of the copper rod is kept at 300 C, and the free end of the aluminum rod is kept at 20 0C), 1- Calculate the temperature at the copper-aluminum interface (between the two rods). 2- Calculate the rate of heat transfer (in J/s) between the two ends