(P4). 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) Is it possible to close the road from A to B for construction and keep traffic flowing on the other streets? Explain.
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