Cold water is used to cool hot air in a well-insulated heat exchanger. Water enters the heat exchanger at T1=10 degree F and exits at T2=25 degree F. Air enters the heat exchanger with a flow rate of 3,100 lbm/hr at T3=340 degree F and remains at constant atmospheric pressure as it moves through the heat exchanger. The air then exits at T4=77 degree F. Assume the air as an ideal gas with variable specific heats and the water to be an incompressible liquid. Also assume that there are negligible changes in kinetic and potential energy. What is the heat transfer form air into the cold water for this process in Btu/hr? What is the mass flow rate of the water in lbm/hr required for this process?