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Anonymous
km is a measurement of distance and mph is a measure of velocity.
However
1 mph =1.609344 kph (km per hour)
so
400 mph = 400 * 1.609344 = 643.7376 kph
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400 km in what time is missing
Answer: 400 km/h = 248.548 mph
400 km = 4*1014 nm
6 mph = 9.6561 km/h
429.7 km/h