Two miles in 14 minutes is a speed of 13.8 kilometers per hour.
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230 mph = 370.15 kmph
470 miles = 756.39168 kilometers
140 kilometers is about 87 miles.
4 km = 2.49 miles
(19.76 miles)/[(42.23 minutes)/(60 minutes/hour) = 28.08 miles/hour, to the justified number of significant digits.