15 miles is equal to 15 x 1.609344 = 24.14016 kilometres. Dividing 400 kilometres by 24.14016 kilometres per hour. and rounded to two decimal places, gives 400/24.14016 = 16.57 hours or approximately 16 hours 34 minutes.
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30 minutes
The number of hours it will take to travel 308 miles is(308)/(your average speed, in miles per hour)
12 hours.
40 minutes
It takes five hours, 14 minutes to travel 314 miles at 60 miles per hour.