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An aircraft flies with a groundspeed of 115 kt a distance of 25 cm on a chart with a scale of 1 : 1 000 000. Calculate the flight time required.

  • A

    1 hour and 22 minutes

  • B

    1 hour and 28 minutes

  • C

    1 hour and 10 minutes

  • D

    1 hour and 5 minutes

The chart's scale illustrates the relationship between the depicted length on the chart and the actual distance on Earth's surface and is commonly expressed as a fraction, for example "1: 1 000 000":

  • Chart Scale = Chart distance / Earth distance

1. Calculate the ground (Earth) distance:

For a chart distance of 25 cm, the Earth distance in cm is:

  • Earth distance (cm) = 25 cm x 1 000 000 = 25 000 000 cm

2. Convert the Earth distance to NM:

  • 1 m = 100 cm
  • 1 NM = 1852 m
  • 25 000 000 cm / 100 cm / 1852 m = 135 NM

3. Calculate the flight time:

  • Time = Distance / GS
  • Time = 135 NM / 115 kt = 1.17 hr

4. Convert the flight time into hours and miniutes:

  • 1 hr + (0.17 x 60) = 1 hour and 10 minutes

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