In this problem the solution is obvious. But, the purpose is to illustrate if-then constrains. If-Then Constraints in a Logistics Problem The Pratt Corporation must ship a large gas turbine from City 4 to City Fand can select any of the moutes that are shown on the accompanying map. On the map, the numbers indicate trans- portation costs along the route segments. The firm wants to select a route that will minimize total costs. $35 $20 $30 $10 $15 S10 $25 0 $40