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@ta2
75 gear inches * 0.0254 * pi[U][/U] = 5.985 metres development
40 miles = 64,373.76 metres
64,373.76 / 5.985 = 10755.85 revolutions
10,755.85 revs / 60 minutes = 179.264 RPM
or
(miles * 1,609.344) / (GI * 0.0254π) / 60 = 179.272 RPM to be precise