Here it is:
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Multiply km/h x 0.621371 to get mph. Example, 60 km/h x 0.621371 = 37.2822 mph
Kilometers is a distance 15 mph is a speed but 15 mph = 24.14 kilometers per hour The formula to convert miles to km15 mi* 1.609344 km 1 mi = 24.14016 km
0.621 is the conversion factor. So, kph x 0.621 = mph
17,895.5 mph
Also, you cannot convert kilometers to miles per hour (mph) because kilometers are a measure of distance whereas mph is a measure of speed. The two measure different things and by the basic principles of dimensional analysis, any attempt to convert from one to the other is not valid.