Pre-Calculus - Solving a word problem with a quadratic equation

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If it is an open top box, won't it have 5 faces not 4? Only the top will be missing, right? So the bottom will still be there, right?

manasimalhotra
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Good informative video.Thankyou for uploading.

DYoung
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the highway department is asked to costant a road between point A and point B. point A lies on an abandoned road that runs east-west. point B is 3 miles north of the point of the old road that is 5 miles east of A. the engineering division proposes that the road be constructed by restoring a section of the old road from A to some point p and constructing a new road from p to B. given that the cost of restoring the old road is $2 000 000 per mile and the cost of a new road is $4 000 000 per mile how much of the old road should be restored so as to minimize the cost of the project.

haymitaddess