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Sleeping
It means any length of time that is both not less than 4 hours and not more than 6 hours.
No. There are 60 minutes in one hour, so 0.2 hours = (0.2 x 60) = 12 minutes. 6.2 hours means 6 hours and 12 minutes. 6 hours and 15 minutes is the same as 6.25 hours.
6
Assuming you mean: what is the speed if 4000 miles takes 6 hours: speed = distance/time = 4000 mi / 6 hr = 666 2/3 mph