One mile is 5280 feet. One foot is 0.3048 metres. therefore one mile is 1609.344 meters, or 1.609344 km.
so, the formula is km/h = mph × 1.609344 - you could use 1.6 or 8/5 for an approximation.
Tablesmph: kph10: 16
15: 24
20: 32
25: 40
30: 48
35: 56
40: 64
45: 72
50: 80
55: 89
60: 97
65: 105
70: 113
75: 121
80: 129
85: 137
90: 145
kph: mph
10: 6
20: 12
30: 19
40: 25
50: 31
60: 37
70: 43
80: 50
90: 56
100: 62
110: 68
120: 75
130: 81
140: 87
150: 93
Algebraic Steps / Dimensional Analysis1 mi/hr*5280 ft/hr
1 mi/hr*1 m/hr
3.2808 ft/hr*1 km/hr
1000 m/hr=1.609344 km/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