9.5-3. The next diagram depicts a system of aqueducts that originate at three rivers (nodes RI, R2, and R3) and terminate at a major city (node T), where the other

nodes are junction points in the system. The city water manager wants to determine a flow plan that will maximize the flow of water to the city. Using units of thousands of acre feet, the tables below the diagram show the maximum amount of water that can be pumped through each aqueduct per day.