Question 450951
{{{l/w = 5/4}}}

==> {{{l = (5/4)w}}}

Now,  324 = 2l + 2w ==> l + w = 162

==> {{{(5/4)w + w = 162}}}

==> {{{(9/4)w = 162}}}

==> w = 72 meters, and {{{l = (5/4)*72 = 90}}} meters.