Answer: 400 km/h = 248.548 mph
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400 km per hour is 248.55 miles per hour.
400 meters in 43.18 seconds equates to an average speed of 20.72 miles per hour.
1 mile = 1.609344 kilometers 400 million miles = (400 million x 1.609344) = 643.7376 million kilometers = 643,737,600kilometers (rounded)
There are 5280 feet in one mile. Therefore, 400 miles per hour is equal to 400 x 5280 = 2112000 feet per hour.
400/5 = 80 miles per hour