Answer :
[tex]x-\ width\\\\5x-\ length\\\\
perimeter= 2width+2length\\\\104\geq2x+2*5x\\\\
104\geq12x\ \ \ \ | divide by\ \\\\ x\leq 8 \frac{2}{3}\\\\ The\ greatest\ dimensions:\\
16\frac{4}{3}\ m\ and\ 43\frac{1}{3}m
[/tex]