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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