The amount of lumber produced and consumed by three states is shown in the following tab...

The amount of lumber produced and consumed by three states is shown in the following table. Intrastate shipment distances are 200 miles and interstate distances are 800 miles (between states 1 and 2), 1000 miles (between states 1 and 3), and 400 miles (between states 2 and 3). Assuming an impedance function of the form 1/d, estimate the tonnage of lumber that will travel between the three states: