The unknowns are the number of shoppers per minute, corresponding to the letters on the diagram
If we set traffic in = traffic out at each intersection, we get the following system of equations
|In = Out||Equation|
|Intersection near Present Location:||40 + x + s = z||x - z + s = -40|
|Intersection near Burger King:||40 + t = y + s||y + s - t = 40|
|Intersection near Apple Computer:||60 + z = 50 + t||z - t = -10|
and the general solution is:
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