System A has a temprature of TA = 300K and Ua = 30 MJ/kmol. System B has tempratuer TB = 200K and UB = 60MJ/kmol. The two systems are brought into contact (and are open to each other). Describe what happens next, in terms of heat flow and diffusion. Describe (qualitatively) the final (equilibrium) state of the combined system.