At walking pace, about 25 hours non-stop.
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Time = Distance/Speed = 825/75 = 11 hours
Travelling at a constant 45 mph: 6497 / 45 = 144.38 hours (6 days approximately).
If we say one painter covers one unit in one hour, then 8 painters cover 8 units in an hour and 48 units in 6 hours. The gymnasium therefore has 48 units of wall. 12 painters cover 12 units in an hour and so will take only 4 hours to cover the 48 units
Time = Distance/Average speed = 115/100 = 1.15 hours or 1 hour and 9 minutes.
This question is slightly ambigously phrased. If it has its normal plain English meaning, the answer is that one man will cover 16 miles, just like the other three that are walking alongside him.