You will need a minimum of 38.6 square yards of carpet to cover that area.
2 yards
You will need 7.1 square yards of fabric.
The width 12 feet is four yards, so the area would be 4 yards * 50 yards = 200 square yards. You would need 200 square yards of carpeting to cover that area.
To cover that area to that depth - you would need just under 8 cubic yards of soil.
47.55 cubic yards . 4" would be 5.23 cubic yards.
You will need a minimum of 38.6 square yards of carpet to cover that area.
At 4 mph, you would cover 88 yards in one minute. In 45 seconds, you would cover 66 yards (88 multiplied by 0.75).
2 yards
You will need 7.1 square yards of fabric.
You would need 31.88 cubic yards of topsoil to cover 855 sq feet at 6 inches deep.
The width 12 feet is four yards, so the area would be 4 yards * 50 yards = 200 square yards. You would need 200 square yards of carpeting to cover that area.
20 feet x 20 ft x .3333 ft = 133.33 cubic feet / 27 cubic feet per yard = 4.94 cubic yards
577 yards.
38.67 square yards, 40 to be on the safe side.
8.25 cubic yards of concrete
To cover that area to that depth - you would need just under 8 cubic yards of soil.