[tex]Area=width*length\\\\
Area=480in^2\\
length=1\frac{1}{5}width\\\\
480=width*1\frac{1}{5}width\\\\
480=1.2width^2\ \ \ | divide\ by\ 1.2\\\\
width^2=400\ \ \ | make\ square\ root\\\\
width=20in\\\\
length=20*1.2=24\ in\\\\
Dimensions:\ 24inx20in[/tex]