Vy and Hung are working on a Science project. If Vy works on it alone for 6 hours and let Hùng take over, Hùng needs another 12 hours to complete. If

Vy and Hung are working on a Science project. If Vy works on it alone for 6 hours and let Hùng take over, Hùng needs another 12 hours to complete. If Hung works alone from the beginning, he will finish it in 16 hours. How long will it take Vy to finish the project if she works alone from the beginning to the end?