Assuming that you can sustain the speed non-stop, and that you do not get arrested for speeding, it would take 15.66... hours = 15 hours 33 minutes.
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At 55mph about 10 hours
It takes five and a half hours to drive 253 miles at 46 mph.
To find out how long it will take to drive 470 miles at 40 mph, divide 470 by 40. The answer is 11.75 hours or 11 hours and 45 minute.
distance/speed = time (miles)/(miles per hour) = (hours)
17.25 hrs