Omar 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 3 clients who did plan a and 8 who did plan b. on tuesday there were 5 clients who did plan a and 2 who did plan b. omar trained his monday clients for a total of 7 hours and his tuesday clients for a total of 6 hours. how long does each of the workout plans last?