We're building another box! This box is to be constructed with a total volume of 1280 ems, but the sides have different costs. The top, bottom, left and right sides cost $2 per cmz, but the front and back cost $5 per cm2 . What are the dimensions of the box that have the correct volume, but minimize cost? Separate your answers with a comma, i.e., x,y,z. (Note that the order doesn't matter.)