Car's speed (km/h) 80 60- 40- 20 0 2 4 6 8 Distance from home (km) 12. A school vending machine sells cartons of milk and juice. On a typical day: No cartons are sold between 7 A.M. and 8 A.M., or from 5 P.M. onward. The machine has a capacity of 100 cartons. At 7 A.M., it is three-quarters full. From 8 A.M. to 10 A.M., 10:15 A.M. to noon, and from 1 P.M. to 3 P.M. the students are in class. The machine is filled at 11 A.M. and at 4 P.M. Sketch a graph of the number of cartons in the vending machine as a function of time. Explain what each section of the graph represents.