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Refer to figure.
From the extract of a flight log above, calculate the average groundspeed experienced from MARGY to COLOM.
  • A
    210 kt
  • B
    236 kt
  • C
    193 kt
  • D
    201 kt

Refer to figure.

To calculate the average groundspeed from MARGY to COLOM, add up the distance to AUZON then the distance to COLOM; 18 + 45 = 63 nm total distance.

Calculate the difference in times from the ATA (Actual Time of Arrival) column, 22:47 - 22:29 = 0:18 (18 minutes).

Then simply do the calculation for speed = distance / time.
Groundspeed = 63 / (18/60) = 210 kt.

Note that it isn't very realistic for an aircraft to average 83 kt groundspeed for one leg and 540 kt for the next, as is given in this flight log.

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