Chapter 9.2, Problem 6SP

Refer to the figure. Assume that traffic flows freely with flow rates given in vehicles per hour.

a. If the traffic between intersections $D$ and $A$ is $400$ vehicles per hour, determine the flow rates $x_1,x_2$ , and $x_3$ .

b. If the traffic between intersections $D$ and $A$ is between $380$ and $420$ vehicles per hour, determine the flow rates $x_1,x_2$ , and $x_3$ .