Hover or tap underlined Spanish terms to see their translation and exam tip.
El día 28 de febrero de 2021, siendo hora UTC 13:12:08, se desea saber la hora civil del lugar en un punto de longitud 060º23’W.On 28 February 2021, when UTC is 13:12:08, find the local civil time at a point of longitude 060º 23’ W.
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Correct answer: a) 09:10:36 (28th)
Why it is correct
Longitude 060º 23′ W equals 4h 01m 32s west of Greenwich (60º = 4h; 23′ × 4s = 1m 32s). Subtracting from UTC: 13:12:08 − 04:01:32 = 09:10:36 on the 28th.
Why the others are not
- b) Subtracts only the 4 hours for 60º and forgets the 23′ (1m 32s).
- c) Adds 4h 01m 32s and steps back a day.
- d) Adds 4h 01m 32s as if the longitude were east.
How to work it out in the exam
- In west longitude, HcL = UTC − L(t).
Where this question comes from
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de febrero · CY Test 2 · question 11 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.