400 square feet equals 57,600 square inches.
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400 sq ft 54 sq ft per ton @ 3" 400/54=7.4 tons
400 ft * 900 ft = 8.26 acres, approx.
Assume the dimension is 100 ft by 400 ft. By the area formula: A = 100 ft * 400 ft = 40,000 ft² Note that 1 ft² ≈ 2.296 x 10-5 acres. Then, 40,000 ft² ≈ 0.9183 acres
1.377
120,000 sq ft