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Refer to figure.
The Charter flight log is filled out correctly by the pilot of a light twin-engined aeroplane. Calculate the average Groundspeed from TOC to TORDU and the ETA at RODRA.
  • A
    183 kt; 07:17
  • B
    171 kt; 07:05
  • C
    183 kt; 07:10
  • D
    171 kt; 07:08

Refer to figure.
The aircraft covered the flight leg fromTOC to TORDU in: 06:46 - 06:10 = 36 min.

So, its Average Actual Groundspeed will be: TOC - TORDU distance / TOC - TORDU time = (73 + 37 NM / 36 min) x 60 = 183 kt.

From TOC to RODRA, the altitude (FL090), TAS (190 kt), Track (047) and Heading (055) remain the same. The 1º increase in both track and heading at the last flight leg is negligible and will not alter the result significantly.

Thus, the flight time from TORDU to RODRA is: TORDU - RODRA distance / Actual GS = (71 NM / 183 kt) x 60 = 23 min.

Therefore, the ETA at RODRA will be: ATO TORDU + flight time from TORDU to RODRA = 06:46 + 23 = 07:09.

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