=9-11 The Krampf Lines Railway Company specializes in coal handling. On Friday, April 13, Krampf had empty cars at the following towns in the quantities indicated:

Town Supply of Cars Morgantown 35 Youngstown 60 Pittsburgh 25 By Monday, April 16, the following towns will need coal cars as follows:
Town Demand for Cars Coal Valley 30 Coaltown 45 Coal Junction 25 Coalsburg 20 Using a railway city-to-city distance chart, the dispatcher constructs a mileage table for the preceding towns. The result is shown in the table below.
Minimizing total miles over which cars are moved to new locations, compute the best shipment of coal cars.