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Given:

True course: 270° 
TAS: 100 kt 
Wind: 090°/25 kt 
Distance: 100 NM

The flight time equals...

  • A

    62 Min.

  • B

    37 Min.

  • C

    48 Min.

  • D

    84 Min.

Refer to figure.
We can use a flight computer (CRP-5) to calculate the groundspeed using the following steps:

  1. Set the center to your True Airspeed (TAS) of 100 kt.
  2. Bring wind direction of 090° under the “TRUE HEADING”.
  3. Mark a dot at the wind speed of 25 kt BELOW the center, at 75 kt.
  4. Bring true course of 270° under the “TRUE HEADING”.
  5. Read the Groundspeed (GS) of 125 kt.

The flight time is given by the formula:

  • Flight time = Distance / Groundspeed = 100 NM / 125 kt = 0.8 hr or (0.8 x 60) 48 min.

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