Air enters a heat exchanger at a rate of 5000 cfm (ft3/min) at a temperature of 50 and pressure of 14.7 psia. The air is heated by hot water flowing in the same exchanger at a rate of 11,200 lbm/h, which decreases in temperature by 10. At what temperature does the air leave the heat exchanger? For water, cp = 1 Btu/lbm. For air, cp = 0.24 Btu/lbm, and specific gas constant R = 53.35 Btu/lbm.