Goran the trainer has two solo workout plans that he offers his 2 clients: plan a and 5 plan b. each client does either one or the other (not both). on wednesday there were 2 clients who did plan a and 5 who did plan b. on thursday there were 8 clients who did plan a and 3 who did plan b. goran 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?