By Postal regulations, the maximum combined girth and length of a rectangular package sent by priority mail is 120 inches. The length is the longest dimension, and the girth is the perimeter of the cross section. Find the dimensions of the package with maximum volume that can be sent through the mail.

( Assume the cross section is always a square with side length x. ) Please fully explain and show me how you got the answer, if possible include the graph.

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