KöMaL 2018 K592

Ann, Belle and Charlotte are doing a job together. The three of them finish it 6 hours sooner than Ann would finish it alone, 1 hour sooner than Belle would finish it alone, and they take half as much time together as Charlotte would take alone. If Ann and Belle work together without Charlotte, they finish the job in 80 minutes. How long would it take each girl Ann and Belle to do the job alone? (Express your answer in minutes.)