How does one solve these notes questions? (work included)

11. Mr. O. ran the Disney Marathon in 2 hours 18 minutes. Remember a marathon is 26.2 miles. Show that at least twice he had to be running at a rate of 11 miles per hour. 12. Cecil's ABC Cars sells used automobiles. His sales, for the year, S, are a function of time, in months, given by S(t) = 240 (6 -). "+ +2). Find the average rate of cars sold over the entire year for O S t s 12. During what month does the average rate of car sales equal the rate of change of the car sales? @ lean Adams Flaminon Math I10 2 13. Contaminated water is being pumped from a retention pond. R(t) is the amount of water that is left in the pond at time t, measured in hours. t, hours 0 3 6 9 12 15 18 21 24 R(t) 20,000 17,000 16,000 14,500 13,000 10,000 9,000 7,000 5,600 gallons A. Using correct units of measure, find the average rate of change of R(t) from t = 3 hours to t = 21 hours. B. Estimate the rate that water is being pumped at t = 8 hours. Use the correct units. Explain what this value means in the context of the problem. C. Is there a time on 0