A stream of warm water is produced in a steady-flow mixing process by combining 1.0 kg s-1 of cool water at 25oC with 0.8 kg s-1 of hot water at 75oC. During mixing, heat is lost to the surroundings at the rate of 30 kJ s-1, What is the temperature of the warm-water stream? Assume the specific heat of wader constant at 4.18 kJ kg-1 K-1.