For a flight of 230 nautical miles at an average groundspeed of 93 knots with a fuel consumption rate of 5.6 gallons per hour, how much fuel is used?

To determine the amount of fuel used for a flight of 230 nautical miles at an average groundspeed of 93 knots, you first need to calculate the total flight time. The flight time can be found by dividing the distance by the groundspeed.

Starting with the calculation:

• Distance: 230 nautical miles

• Groundspeed: 93 knots

Flight time = Distance / Groundspeed

Flight time = 230 nautical miles / 93 knots ≈ 2.477 hours

Next, to find the total fuel used, multiply the flight time by the fuel consumption rate. The fuel consumption rate is given as 5.6 gallons per hour.

Total fuel used = Flight time × Fuel consumption rate

Total fuel used = 2.477 hours × 5.6 gallons per hour ≈ 13.9 gallons

Rounding this, you arrive at approximately 13.8 gallons, making it the correct choice. Understanding these calculations helps in flight planning to ensure you have enough fuel for your journey, taking into account both the distance and the aircraft's fuel efficiency.