Two streams of moist air mix adiabatically at a pressure of 1 atm to form a third stream. The first flow has a temperature of 40°C, a relative humidity of 50% and a volumetric flow of 3 L/s, while the second has a temperature of 20°C, a relative humidity of 80% and a volumetric flow of 1 L/s. Calculate a) the temperature of the third stream, b) its relative humidity, and c) rate of exergy destruction. Consider To=25°C.