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An aircraft travels 110 NM within 01:25. The ground speed (GS) equals...

  • A

    120 km/h.

  • B

    160 km/h.

  • C

    86 kt.

  • D

    78 kt.

The speed in aviation is expressed either in km/hr or in knots (NM/hr).

This question is based on rule of three, where three values are known, looking for the fourth unknown one.

The aircraft travels 110 NM in (01:25) 85 minutes. What is the distance travelled in 60 minutes (or 1 hour)?

  • (110 NM x 60 min) / 85 min = 78 knots, or
  • 78 knots x 1.852 m = 144 km/hr

NOTES:

  • 1 NM = 1.852 km
  • Do not confuse knots (NM/hr) with mph. Mph (miles per hour) refers to the statute miles per hour, where 1 statute mile (or just mile) = 1609 m and 1 NM = 1.15 SM.

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