Kareem 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 wednesday there were 5 clients who did plan a and who did plan b. on thursday there were 3 clients who did plan a and 8 who did plan b. kareem trained his wednesday clients for a total of 6 hours and his thursday clients for a total of 7 hours. how long does each of the workout plans last?