3. Heres an easy one. I want to take a shower and need some warm water at65 C. I have hot water available at 80 C and cold water at 40 C (brrr).What is the mass ratio of hot to cold water. (You may assume the specific heat is 1 cal/gC for both.) (Hint : assume cold flow rate is 100 kg/min and calculate the needed hot rate .. then do the ratio. Otherwise you can do it algebraically...)