Distance cannot be expressed in time. If it could, then you'd be able to figure out how many minutes high your house is, and how many miles of sleep you had last night.
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21 km/h
1 hour = 3600 seconds 1 mile = 1.609344 km 1609 mi/hr * 1.609344 km/mi ~= 2589.43 km/h 2589.43 km/h / 3600 seconds/hr ~= 0.71929 km/s
800 km per hour
77 kph
696km/320km x 4 = 8.7 hrs