Distance = Rate * Time
or, for our purposes
Time = Distance/Rate
Time = 280 km/70 kmh
= 4 hours
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To work this out divide 280 by 70.
It will take 4 hours to travel 280km at 70km per hour.
30 minutes
It will take six hours.
The number of hours it will take to travel 308 miles is(308)/(your average speed, in miles per hour)
12 hours.
one hour nine minutes and 4 secounds