320 km per hour equals 198.83 miles per hour.
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320 km/h = about 198.84 mph
45 km = 28 miles so 45 km per hour = 28 miles per hour.
90 minutes = 1.5 hours so speed = 320/1.5 km per hour = 213.33... recurring km per hour.
About 55 miles per hour.
1 km = 0.6214 miles so 100kmh = 62.14 km per hour.