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City have a focal point 36 of refuse every day from the waste disposal plant (node No. 37) returned from the litter. A current load of 6 tons truck. Each collection point needs to load 10 minutes, average speed of vehicles is 40 km/h (night transport, do not consider the phenomenon of traffic congestion) each car an average of four hours a day. Heavy-duty freight vehicles 1.8 yuan/ton-kilometers garbage truck and loaded the truck with no-load cost of 0.4 yuan/km and the assumption that the streets are parallel to the direction of axes. Please give a satisfactory scheduling of transport, as well as computational procedures.