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Maria the trainer has two solo workout plans that she offers her clients: Plan A and Plan B. Each client does either one or the other (not both). On Friday there were 5 clients who did Plan A and 2 who did Plan B. On Saturday there were 3 clients who did Plan A and 8 who did Plan B. Maria trained her Friday clients for a total of 8 hours and her Saturday clients for a total of 15 hours. How long does each of the workout plans last?