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## Homework Statement

Problem 42 in this pdf file: http://math.rwinters.com/E21b/homework/HW1.pdf [Broken]

## Homework Equations

## The Attempt at a Solution

Starting from the section at the very bottom and going clockwise, let the sections be a, b, c, and d, respectively.

b + 300 = c + 400

c + d + 100 = 250

120 + 150 = a + d

a + 300 = b + 320

Solving these equations using elimination, I get:

a = 270 - t

b = 250 - t

c = 150 - t

d = t

How can I figure out the maximum and minimum traffic volume for each location?

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