Answer:
The area of the first lawn is 64 = 24 square meters.
The area of the second lawn is 6 times bigger, so it is 246 = 144 square meters.
As the second lawn has the same width as the first one, 4 meters, we can calculate the length of the second lawn by dividing the area of the second lawn by its width.
So, the length of the second lawn is 144/4 = 36 meters.