Mrs. Allen, a high school math teacher, is grading quizzes and tests this weekend. She has at most 4 hours, or 240 minutes, to spend grading, and she would like to get at least 60 quizzes and tests graded. On average, it takes her 3 minutes to grade each quiz and 8 minutes to grade each test. If x represents the number of quizzes and y represents the number of tests Mrs. Allen grades this weekend, which graph represents the solution set?