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The planned flight time between two waypoints is 25 minutes, and the distance is 30 NM. During the actual flight, the flight time between these waypoints is found to be 32 minutes. How much lower is the actual groundspeed compared to the one that has been used for planning?

  • A
    16 kt
  • B
    19 kt
  • C
    26 kt
  • D
    10 kt
Ground Speed = Distance / Flight Time
  • Planned Ground Speed:
Planned GS = 30 / 25 min x 60 = 72 kt
  • Actual Ground Speed:

Actual GS = 30 / 32 min x 60 = 56 kt

The Actual GS is: 72 kt - 56 kt = 16 kt slower than the planned.

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