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En un lugar de longitud 010º 00' W es Hora Civil de Lugar (HcL): 22h 40m del día 14. Calcular la Hora Civil de Lugar en la longitud 020º 00' E.At longitude 010º 00' W the local civil time (HcL) is 22h 40m on the 14th. Calculate the local civil time at longitude 020º 00' E.
Show the answer
Correct answer: c) 00h 40m on the 15th.
Why it is correct
Between 010º 00′ W and 020º 00′ E there is a 30º difference eastwards, equal to 2 hours ahead. Adding 2 hours to 22h 40m on the 14th gives 00h 40m on the 15th.
Why the others are not
- a) Adds the 2 hours but forgets to advance the date past midnight.
- b) Subtracts the 2 hours as if the second place were further west.
- d) Subtracts 2 hours and also changes the date without crossing midnight.
How to work it out in the exam
- Every 15º of longitude difference equals 1 hour of time.
- Moving east adds time; crossing 24h advances the date.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de diciembre · CY Test 1 · question 17 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de diciembre · CY Test 3 · question 15 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.