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A hora oficial de California= 04:00 con H+2 de adelanto vigente, en situación estimada= 32º 40,2´N – 119º 26,5´W, calculan la hora civil en Greenwich:At California standard time = 04:00 with a +2h daylight-saving advance in force, at DR position 32º 40.2' N, 119º 26.5' W, calculate the Greenwich civil time:
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Correct answer: d) 10:00
Why it is correct
With a 2-hour advance over zone time, the zone time (Hz) is 04:00 − 2h = 02:00. Since 119º 26.5′ W lies in zone +8 W (119.4º / 15 = 7.96), HcG = 02:00 + 8h = 10:00.
Why the others are not
- a) Adds the 2-hour advance instead of subtracting it before converting to Greenwich.
- b) Forgets to deduct the 2-hour advance in force.
- c) Stops at the zone time (02:00) without adding the 8 hours for zone +8 W.
How to work it out in the exam
- Subtract the advance first (Hz = Ho − 2h) and then add the zone (+8h).
Where this question comes from
- Región de Murcia · 2024 · 2ª convocatoria · CY Tipo 1 · question 13 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.