A box is to be made out of a 10 by 20 piece of cardboard. Squares of equal size will be cut out of each corner, and then the ends and sides will be folded up to form a box with an open top. Find the lengthL, widthW, and heightHof the resulting box that maximizes the volume. (Assume thatWL).

I am struggling with this homework problem, it would be appreciated if someone could help,

Thanks!