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Assume calm wind and an aircraft descending from 9000 ft to 1500 ft. The rate of descent (RoD) equals 1200 ft/min. The elapsed time will be...

  • A

    6 min.

  • B

    15 min.

  • C

    12 min.

  • D

    8 min.

Rate of descent (RoD) is a vertical speed and represents the rate of decrease of the vertical height per unit of time, usually expressed in feet per minute (ft/min).

The height difference during the descent is:

  • 9000 ft - 1500 ft = 7500 ft.

With a Rate of descent of 1200 ft/min, the aircraft will descend 7500 ft in:

  • Flight time = Height difference / RoD = 7500 ft / 1200 ft/min = 6 min approximately.

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