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:

By Monday, April 16, the following towns will need the numbers of coal cars listed:

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 on this page.
Minimizing total miles over which cars are moved to new locations, compute the best shipment of coal cars.

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TOWN SUPPLY OF CARS Morgantown 35 Youngstown Pittsburgh 60 25