That would depend on how fast the airplane is flying. If the plane is flying 425 miles per hour it would take 1 hour. At 212.5 miles per hour it would take 2 hours.
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5 hours
To work thi out, first note that there are 60 minutes in an hour. This means that to convert from hours into minutes you have to multiply by 60. In this case we have 425 hours, so do: 425 x 60 = 25,500 Therefore there are 25,500 minutes in 425 hours.
425/10.8 = 39.35 miles per gallon (rounded)
425 ÷ 25 = 17
There are: 425*60 = 25,500 seconds