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NavigationQuestion 282 of 934

A flight of 400 NM has a groundspeed of 100 knots. The airplane uses 5 gallons per hour. How much fuel does the flight use?

  1. 20 gallons
  2. 16 gallons
  3. 25 gallons
  4. 40 gallons
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Correct answer: 20 gallons

The flight takes 4 hours. 4 hours times 5 gallons per hour gives 20 gallons.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 16: Navigation — Fuel Consumption, page 399

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Questions last reviewed: 18 October 2026