8.5 acres = 0.0133 square miles.
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85 miles
85 miles is greater.
The square root of 85 is 9.21954445729288707412Note: 9.21954445729288707412 x 9.21954445729288707412 = 85
Square root 85 = ± 9.2195444572929
About 12.75 miles at that rate of travel.