People join the line for a particular amusement park ride at a rate R, measured in people per hour, given by the graph shown to the right. 2000- There are 600 people waiting in line at noon. If the ride can take 900 people per hour, how many are waiting 1500- O in line at 5 P.M.? 1000- 500- noon 1 P.M. 2 P.M. 3 P.M. 4 P.M. 5 P.M. . . . If the ride can take 900 people per hour, there are people waiting in line at 5 P.M. (Simplify your answer.)