A mile is approximately 1.6 km. So you would multiply the mph by 1.6 to get the kmph. Lets say you were going 55 mph:
55 mi*
1.609344 km
1 mi
=
88.51392 km
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To convert mph to kmph, 1.61. For kmph to mph, 0.62
meaning of 100 mpm?
one should divide kmph by 60. i.e. 120 kmph = 120/60 kmpm = 2 kilometers per minute
126mph is 202.777 kmph
3 mph = 4.83 kmph