text: Hose # 1 & #3 flow at a rate of 1/6 of a pool per hour.\nHose # 2 flows at a rate of 1/2 a pool per hour.\n\nCombining them you get 1/6 + 1/6 + 1/2 = 5/6 pool per hour. To get 1 pool full will take 6/5 of an hour or 72 minutes.