Kevin 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 Monday there were 8 clients who did Plan A and 3 who did Plan B. On Tuesday there were 2 clients who did Plan A and 5 who did Plan B. Kevin trained his Monday clients for a total of 15 hours and his Tuesday clients for a total of 8 hours. How long does each of the workout plans last? Length of each Plan A workout: hour(s) Length of each Plan B workout: hour(s) X ?