etawel

for the mixing tab of water: the temperature hot water is 60 °C; the temperature of cold water is 20 °C. after mixing hot and cold water by the tab, the temperature of mixture watar was 40 °C and the flow rate was 0.061 L/s. I would like to calculate the percent of hot water is used from the mixture which was 4 Letters what is equation to find the volume of hot water ? could you please help me.