A flow of 1 kg/s carbon dioxide at 1600 H, 100 kPa is mixed with a flow

Question:

A flow of 1 kg/s carbon dioxide at 1600 H, 100 kPa is mixed with a flow of 2 kg/s water at 800 H, 100 kPa and after the mixing it goes through a heat exchanger where it is cooled to 500 H by a 400 H ambient. How much heat transfer is taken out in the heat exchanger? What is the entropy generation rate for the whole process?