Need !
john 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. john trained his friday clients for a total of 6 hours and his saturday clients for a total of 12hours. 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)