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An aircraft departs an airfield on the 170° E meridian at 01:30 LMT on the 11th February. It flies on an easterly heading and lands at an airfield on the 160° W meridian after 3 hours. What is the LMT and the date on arrival at the destination airfield.
  • A
    04:30 LMT on the 10th February
  • B
    06:30 LMT on the 10th February
  • C
    04:30 LMT on the 12th February
  • D
    01:30 LMT on the 10th February
Always work through Greewich LMT (known as UTC)
Departure airfield is on the 170° E meridian,
170 degrees represents 170 x 4 minutes of time (4 minutes of time per degree of longitude).
= 680 minutes
= 11h 20 minutes
So on take off at 0130 LMT on 11th February it is 1410 UTC on the 10th February (take time off going from east to west)
The destination is on the 160° W meridian.
160 degrees represents 160 x 4 minutes of time.
= 640 minutes
= 10h 40 minutes
So on take off at 0130 LMT on 11th February it is 1410 UTC on the 10th February and 0330 LMT on the 10th February at the destination. (take time off going from east to west).
All we have to do now is to add on the flight time to get the answer of arriving at 0630 LMT on the 10th February.

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