Ivan 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 2 clients who did plan a and 12 who did plan b. On Tuesday there were 5 clients who did plan a and 3 who did plan b. Ivan trained his Monday clients for a total of 19 hours and his Tuesday clients for a total of 7 hours. How long does each of the workout plans last?