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Al ser HcG= 23 h 00 m del 23 de abril de 2023, ¿qué Hz y fecha es en un lugar de L= 172º 30' W?When Greenwich civil time (HcG) is 23h 00m on 23 April 2023, what are the zone time (Hz) and date at longitude L = 172º 30' W?
Show the answer
Correct answer: c) Hz = 11h 00m on 23 April 2023.
Why it is correct
Dividing 172º 30′ W by 15º gives 11.5, corresponding to zone +12 W (12 hours behind Greenwich). Subtracting 12 hours from 23h 00m on 23 April gives 11h 00m on the same day, 23 April 2023.
Why the others are not
- a) Subtracts 12 hours but steps back a day without crossing 00h.
- b) Fails to apply the zone difference from Greenwich.
- d) Subtracts 24 hours instead of the 12-hour zone difference.
How to work it out in the exam
- 23h 00m − 12h = 11h 00m on the same day.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · CY Test 1 · question 11 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · CY Test 2 · question 20 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.