Jessica the trainer has two solo workout plans that she offers her clients: Plan A and Plan B. each client either one or the other( not both). On Monday there were 8 clients who did Plan A and 4 who did Plan B. On Tuesday there were 3 clients who did Plan A and 2 who did Plan B. Jessica trained her Monday clients for a total of 9 hours and her Tuesday clients for a total of 4 hours. how long does each of the workout plans last