Arbitrary Distances and Cargo Volumes

Let the distance between two neighboring ports along a façade be 100 units, and the distance between corresponding ports be 10,000 units. Each port at the origin facade (left) has a cargo volume of 2000 units bound to its corresponding port across the sea. For the sake of simplicity, we assume that the unit handling costs on both sides are included in the transportation cost (i.e. they contribute to the fixed transportation costs). There is not enough cargo in any single port for an ocean vessel and the partial loaded vehicle transportation is not economical. The voyage cost of a fully loaded feeder ship is 3,000,000 and it would require 10 trips. Thus, the total transportation costs are 30,000,000.