None.
A mile is a measure of length or distance while an acre is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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Your question is nonsense as:miles are a unit of length; whereasacres are a unit of area.However, if you mean how many SQUARE miles are in 31/2 acres:1 acre = 1/640 sq mi→ 31/2 acres = 31/2 x 1/640 sq mi= 7/1280 sq mi≈ 0.0055 sq mi
7 feet by 23 feet.
2 acres is about 85000 sq ft; at 50 inch cut, that is about 4 feet, so you need to travel 85000/4 = 21, 250 feet which is about 4 miles. At 7 miles per hour that is 4/7 hours = .57 hours, or about 35 minutes
Acres cannot be converted to feet as they are both different types of measurements. As acres is a measurement of area while feet is a measurement of length. A proper equivalent would be square feet. Therefore, 7 Acres = 304920 Square Feet
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