It is 40 inches because 4 feet equals 48 inches
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3 ft 4 inches is 36 in + 4 in = 40 in. The simplified version of 40in is 2sqrt10 inches.
3 feet because 4 ft. is only 36 inches so 3 ft. would be less
To convert inches to feet, divide by 12. 59 inches = 4 ft, 11 inches (1 inch less than 5 ft)
4 ft. 7 is 55 inches, one inch less than 56
12 in = 1 ft → 40 in × 48 in × 60 in = (40 ÷ 12) ft × (48 × 12) ft × (60 × 12) ft = 10/3 ft × 4 ft × 5 ft = 200/3 cu ft = 66 2/3 cu ft ≈ 66.67 cu ft