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Speed = distance / time. Distance = speed × time. Time = distance / speed. Convert units: 1 mph = 1.609 km/h = 0.447 m/s = 0.868 knots. Average speed = total distance / total time (not average of speeds). The harmonic mean applies for equal-distance legs at different speeds. Escape velocity from Earth: 11.2 km/s. Speed of light: 299,792 km/s.
60 mph ≈ 96.561 km/h