21 kilometres is, as the question states, a distance. Miles per hour is a measure of speed. Speed and distance are two different things and you cannot convert one to the other without additional information.
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Miles per hour x 1.6093 = kilometers per hour
56 kilometers per hour is 34.8 miles per hour.
45 kilometers per hour is the same as 27.9 miles per hour.
To convert 200 kilometers per hour to miles per hour, you need to multiply the value in kilometers per hour by 0.621371. Therefore, 200 kilometers per hour is equal to 124.274238 miles per hour. The conversion factor is derived from the definition of a kilometer and a mile.
24.85 miles per hour