Answer
$width=23$ m
and
$length = 40$ m
Work Step by Step
Since we are given that perimeter = 126 m
Formula to calculate the perimeter of a rectangle is :
Perimeter= 2( Length + Width) or, $P= 2(l+w)$
Here, $l= 2w-6$
Thus, $126= 2 (2w-6+w)$
or, $126=4w-12+2w$
or, $126=-12+6w$
Thus, $width=23$ m
and
$length = 2w-6= 2(23)-6= 40$ m
