Hans the trainer has two solo workout plans that he offers his clients: Plan A and Plan B. Each client does either one or the other (not both). On Friday there were 3 clients who did Plan A and 5 who did Plan B. On Saturday there were 9 clients who did Plan A and 7 who did Plan B. Hans trained his Friday clients for a total of 6 hours and his Saturday clients for a total of 12 hours. How long does each of the workout plans last?
