Question 1016172
.
W=width; L=length=W+40yds
.
LW=6000yd^2
(W+40yd)(W)=6000yd^2
W^2+40W=6000
W^2+40W-6000=0 
(W-60)(W+100)=0
W-60=0 -OR- W+100=0
W=60 -OR- W=-100
.
ANSWER 1: The width is 60 yards.
.
L=W+40yds-60yds+40yds=100yds
.
ANSWER 2: The length is 100 yards.
.