A finned-tube heat exchanger operates with water in the tubes and airflow across the fins. The water inlet temperature is 130F while the incoming air temperature is 75F. An overall heat-transfer coefficient of 57 W/m2 C is experienced when the water-flow rate is 0.5 kg/s. The area of the exchanger is 52 m2 and the airflow is 2.0 kg/s for the given conditions. Calculate the exit water temperature, expressed in C.