Multiply MPH by 1.609344 and it will give you KPH
45 * 1.609344 = 72.42048
for the most part multiplying by 1.6 is close enough
28 mph
45 mph is 72.4205 kph
27.96 mph
avg. 72 kph (45 mph)max. 91 kph (57 mph)
50 mph is 31.07 kph.
46 kph = about 28.6 mph
1 kilometre = 0.62137119 miles 270 x 0.62137119 = 167.7702213 270 kph = 168 mph (approximately)
25 mph = about 40.233 kph
avg. 72 kph (45 mph) max. 91 kph (57 mph)
kph x 0.621 = mph
24 kph = about 15 mph. (14.9129086 mph)
360 kph = 223.7 mph
35 kph is 21.75 mph.35 kph = 21.75 mph