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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: kph

10: 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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