About 55 miles per hour.
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45 km = 28 miles so 45 km per hour = 28 miles per hour.
320 km per hour equals 198.83 miles per hour.
1 km = 0.6214 miles so 100kmh = 62.14 km per hour.
3.5 (miles per second) = 20,277.73 km per hour.
88 kph = 54.7 mph