In a textile manufacturing plant, the waste dyeing water (cp=4295 J/kgK) at 80C is to be used to preheat fresh water (c = 4180 J/kg-K) at 10C at the same flow rate in a double-pipe counterflow heat exchanger. The heat transfer sur- face area of the heat exchanger is 1.65 m, and the overall heat transfer coefficient is 625 W/m-K. If the rate of heat transfer in the heat exchanger is 35 kW, determine the outlet tempera- ture and the mass flow rate of each fluid stream.