3. The accompanying figure shows known flow rates of hydro- carbons into and out of a network of pipes at an oil refinery. 200 150 200 25 175 a. Write a linear system whose solution provides the...

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Extracted text: 3. The accompanying figure shows known flow rates of hydro- carbons into and out of a network of pipes at an oil refinery. 200 150 200 25 175 a. Write a linear system whose solution provides the unknown flow rates. b. Solve the system for the unknown flow rates. c. Calculate the flow rates and directions of flow if x, = 50 undx = 0.