Two humid streams are adiabatically mixed at 1 atm pressure to form a third stream. the first stream has a temperature of 40c, a relative humidity of 40%, and a volumetric flow rate of 3 l/s, while the second stream has a temperature of 15c, a relative humidity of 80%, and a volumetric flow rate of 1 l/s. calculate the third stream’s temperature and relative humidity.