Answer :
[tex]A=lh=1440\\h= \frac{2}{5}l\\1440=l( \frac{2}{5}l)\\1440=\frac{2}{5} l^{2}\\3600=l^{2}\\60=l\\\\h= \frac{2}{5}(60)\\h=24[/tex]
H = 24 feet
L = 60 feet
H = 24 feet
L = 60 feet