Distance = speed X time at speed. In this instance, the time is unknown; designate it t. Then 12 miles = 40 miles/hour X t or t = 12/40 hours = 0.30 hours or 18 minutes (60 minutes = 1 hour).
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one hour, obviously :)
It would take approximately 12 hours to drive 672 miles at a constant speed of 56 mph.
Approximately 12 minutes.
About 2 hours 12 minutes.
37 minutes 12 seconds.