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Old 11th Aug 2014, 15:05
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Transsonic2000
 
Join Date: Jan 2006
Location: Europe
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Hi all,

I'd need some help with the following question:

Departure A (25°N 175°W) on 7 January at 1423 LMT. Difference UTC and ST(a) is 11 hr.
Destination B (15°N 155°E). Difference UTC and ST(b) is 10 hr.
Distance along the great circle between A and B is 1790 NM. Average head wind is 19 kt, average TAS 400 kt. Calculate time (standard) and date of arrival at B.

So, I came up with 16:05 (8 Jan) but according to the QDB the correct answer is 16:45 (8 Jan)

Here are my steps how I came up with my answer:
  1. Trip time = Distance / Ground Speed = 1790 NM / 381 = 4 hr 42 min
  2. Convert from LMT to UTC (departure airport) 1423 + 11 = 01:23 (8 Jan)
  3. from UTC to LMT (destination) 01:23 + 10 = 11:23
  4. add trip time: 11:23 + 4:42 = 16:05 (8 Jan)
Many thanks in advance!
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