4.5 hours.
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How long dose it take to go 20 miles at 90 mph
At 40 mph, it would take you 1 hour 30 minutes to drive 60 miles.
7 miles / 10 mph = 7/10 hour, or 42 minutes
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.