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90 mph x 1,6 km/h= 144 km/h
Yes.
15 m/s = 54000 m/h = 54 km/h
3 hours and 10 minutes!
about 402.336 kmh The formula to convert miles to km 250 mi * 63360 in 1 mi * 2.54 cm 1 in * 1 km 100000 cm = 402.336 km