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An aircraft travels 100 km in 56 minutes. The ground speed (GS) equals...

  • A

    58 km/h.

  • B

    198 kt.

  • C

    93 kt.

  • D

    107 km/h.

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 100 km in 56 minutes. What is the distance travelled in 60 minutes (or 1 hour)?

  • (100 km x 60 min) / 56 min = 107 km/hr, or
  • 107 km/hr / 1.852 m = 58 knots

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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