Answer:
4 hrs
Step-by-step explanation:
Total gallons that are in the plane = 48
Used for takeoff and landing = 7.
Remaining that is left to be used while in air = 48-7
                                     = 41.
maximum number of hours the plane can remain in the air= Maximum of   (  [tex]\frac{41}{10}[/tex] )
So maximum of 4 hours.