1 mile = 1.609 kilometres, so a speed in km/h is converted to mph by dividing by 1.609 (or, if you prefer, multiplying by 0.622).
Algebraic Steps / Dimensional Analysis 1 km/hr*1000 m/hr
1 km/hr*3.2808 ft/hr
1 m/hr*1 mi/hr
5280 ft/hr=0.6213711923 mi/hr
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roughly MPH X 1.609
70 miles per hour is 112 kilometers per hour. The formula to convert miles to km 70 mi* 1.609344 km 1 mi = 112.65408 km
To convert miles to kilometers, multiply by 1.6. The same if you want to convert miles/hour to kilometers/hour.
km/sec x 2,236.94 = mph
120 Miles per Hour = 193.12128 Kilometers per Hour The formula to convert miles to km 120 mi* 63360 in 1 mi * 2.54 cm 1 in * 1 km 100000 cm = 193.12128 km