Third, propose an Arena simulation model to simulate the current trash pickup to obtain the total time need to finish the trash pickup in your selected studying area. Please try to provide the information related your Arena simulation model as detail as possible. You should list the data you used with references. Fourth, simulate different scenarios (by either creating a new model or changing the parameters in your previous model) to figure out a way to increase the trash pickup efficiency. You can define the efficiency by yourself, such as the total time needed or cost efficiency considering buying more trucks to pick up the trash at the same time