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The emergency services coordinator for Dade County, Tallys DeCampinas, is interested in locating the county's two ambulances to maximize the number of residents that can and the average times in minutes) required to travel from one region to the next are summarized in the following table: To Region From Region 1 2. 3 4 5 6 1 0 7 4565 2 7 0 326 5 3 4 3 053 7 4 5 2505 6 5 6 6 35 0 4 6 5 5 7640 The population in 1,000s) in regions 1 through 6 are estimated, respectively, as 60, 20, 15, 37, 21, and 35. In which two regions should the ambulances be placed? (a) Formulate an ILP model for this problem to maximize the number of residents (in 1,000s) that can be reached within an average of at most 4 minutes in emergency situ placement of the ambulances allows region i to be serviced within 4 minutes and otherwise. In your constraints for setting the value of Y; only use coefficients of 1 or MAX: Subject to: total ambulances constraint to set value of Y1 constraint to set value of Y2 constraint to set value of Y3 constraint to set value of Y4 constraint to set value of Y5 constraint to set value of Y6 X, Y, binary (b) Implement your model in a spreadsheet and solve it. What is the optimal solution? (X1, X2, X3, X4, X5, X6) - (c) What is the smallest number of ambulances required to provide coverage within 4 minutes to all residents? ambulances (d) Suppose the county wants to locate three ambulances in such a way to provide coverage to all residents within 4 minutes and maximize the redundancy in the system. (A should the ambulances be located? (Select all that apply. Calculate redundancy as the sum of the total number of people (in 1,000s) each ambulance can serve within 4 O region 1 region 2 O region 3 region 4 region 5 region 6