kph x 0.621 = mph.
http://wiki.answers.com/Q/What_is_the_formula_for_...

1. Multiply the speed in mph by 1.609344 km per mile. For example, 55 mph is 88.51392 kph. For most practical intents, multiplying by 1.6 is accurate enough. 2. Convert from kph to
http://www.ehow.com/how_2306811_convertmphkph.ht...

Mph X 1.609344 = Kph. Kph / 1.609344 = Mph.
http://answers.yahoo.com/question/index?qid=200606...

228 KPH equals 141.67 MPH, you might need to slow down there!
http://www.chacha.com/question/whatis228kphconv...
