The accompanying figure shows a network of one-way streets with traffic flowing in the

Chapter 1, Problem 3

(choose chapter or problem)

The accompanying figure shows a network of one-way streets with traffic flowing in the directions indicated. The flow rates along the streets are measured as the average number of vehicles per hour. (a) Set up a linear system whose solution provides the unknown flow rates. (b) Solve the system for the unknown flow rates. (c) If the flow along the road from A to B must be reduced for construction, what is the minimum flow that is required to keep traffic flowing on all roads? 300 400 200 250 750 300 400 100 x2 x4 x3 x1 A B Figure Ex-3

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