A rectangle is 6 meters less than 2 times width, perimeter is 426.

Let width =x

So length = 2x-6

So perimeter = 2[2x-6+x]

=2(3x-6)

=6x-12

But perimeter= 416

or 6x-12=426

or 6x=426+12=438

or x=438/6=73 m

So length =2x-6=2*73-6

=146-6

=140.

So length= 140 m and width =73 m.