Solving a word problem using a system of linear equations of the form Ax + By = C
Ravi 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 2 clients who did Plan A and 5 who did Plan B. On Saturday there were 8 clients who did Plan A and 3 who did Plan B. Ravi trained his Friday clients for a total of 8 hours and his Saturday clients for a total of 15 hours. How long does each of the workout plans last?