Assume that traffic flows freely through the intersections $A,B,C,$ and $D.$ The values $x_1,x_2,x_3,$ and $x_4$ and the other numbers in the figure represent flow rates in vehicles per hour.

Part: $\frac{0}{2}$

Part $1$ of $2$

$($a$)$ Assume that traffic flows at a rate of $230$ vehicles per hour on the stretch of road between intersections $D$ and $A.$ Find the flow rates $x_1,x_2,$ and $x_3.$

$x_1=$ vehicles per hour

$x_2=$ vehicles per hour

$x_3=$ vehicles per hour

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