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200 mph
8 mph
1 mph = 1.609344 kphSo just multiply your speed in mph by 1.6 (or you can use more decimal places to get a more accurate answer).so for example, 55 mph x 1.6 = 88 kph
27.3 seconds at five miles per hour.
315 kilometers per hour = 195.731926 mph (miles per hour)