A rigid tank A of volume 600 liters contains 3 kg water at 1200C and the rigid tank B is 400 liters with water at 0.6 MPa, 2000C. They are connected to a piston cylinder initially empty with closed valves. The pressure in the cylinder should be 0.8 MPa to float the piston. Now the valves are slowly opened so the water reaches a uniform state with the valves open. Find the final temperature and the total entropy generation, assuming no heat transfer.