Process water with a specific heat capacity of 4.182 kJ kg-1 K-1 flows at a rate of 0.050 kg s-1 through a heat exchanger where its temperature is increased from 16°C to 85°C. Heat is supplied by

exhaust gases (mean specific heat capacity 1.075 kJ kg-1 K-1) which enter the heat exchanger at a temperature of 420°C. If the mass flowrate of the exhaust gases is 0.044 kg s-1, determine their outlet temperature.