From the area of 40*60 = 2400 sq.yards subtract the area
60*6 = 360 sq.yards of one strip
and subtract the area
40*6 = 240 sq.yards of the other strip.
You will get then 2400 - 360 - 240 = 2400 - 600 = 1800 sq.yards.
To this, add the area 6*6 = 36 sq.yards of the intersection square,
since you subtracted it twice.
By doing this way, you will get the final
ANSWER. 1836 sq.yards.