Keitaro walks at a pace of miles per hour and runs at a pace of miles per hour. Each month, he wants to complete at least miles but not more than miles. The system of inequalities represents the number of hours he can walk, , and the number of hours he can run, , to reach his goal. A graph shows w on the x-axis, from 0 to 30, and r on the y-axis, from 0 to 24. Two solid lines are shown. The first line has a negative slope and goes through (0 comma 6) and (12 comma 0). Everything above and to the right of the line is shaded. The second line has a negative slope and goes through (0 comma 15) and (30 comma 0). Everything to the left of the line is shaded. Which combination of hours can Keitaro walk and run in a month to reach his goal? Responses 12 hours walking; 10 hours running 12 hours walking; 10 hours running 4 hours walking; 3 hours running 4 hours walking; 3 hours running 2 hours walking; 12 hours running 2 hours walking; 12 hours running 9 hours walking; 12 hours running