28. Union Express has 60 tons of cargo that needs to be shipped from Boston to Dallas. The shipping capacity on each of

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28. Union Express has 60 tons of cargo that needs to be
shipped from Boston to Dallas. The shipping capacity on each of the
routes that Union Express planes fly each night is shown in the
following table:
Nightly Flight Segments
Capacity (in Tons)
Boston to Baltimore
30
Boston to Pittsburgh
25
Boston to Cincinnati
35
Baltimore to Atlanta
10
Baltimore to Cincinnati
5
Pittsburgh to Atlanta
15
Pittsburgh to Chicago
20
Cincinnati to Chicago
15
Cincinnati to Memphis
5
Atlanta to Memphis
25
Atlanta to Dallas
10
Chicago to Memphis
20
Chicago to Dallas
15
Memphis to Dallas
30
Memphis to Chicago
15
Will Union Express be able to move all 60 tons from Boston to
Dallas in one night?
a. Draw a network flow model for this problem.
b. Create a spreadsheet model for the problem and solve
it.
c. What is the maximum flow for this network
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