255 miles is 255 miles - whatever the speed.
At least until you get to Lorentz contraction which kicks in due to relativity when you are travelling close to the speed of light. At 35 mph the Lorentz contraction is less than a quadrillionth so probably less than the measurement error.
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35 mph = 3,080 feet per minute.
35 kph = 21.75 mph
12,320 feet or 2.33 miles.
837/35 = 23 and 32/35 hours
6 minutes 51 seconds at a constant 35 mph, excluding speed changes or stops.