Hover or tap underlined Spanish terms to see their translation and exam tip.
Estando en la situación (A) l= 40º30'N; L= 30º30'E, tenemos una HcL (A)= 12h 40m del día 20 de abril de 2024. ¿Qué hora civil será en un lugar (B) de situación l= 25º15'S; L=10º00'W?At position A (l = 40º 30' N, L = 30º 30' E), the local civil time HcL(A) is 12h 40m on 20 April 2024. What is the local civil time at position B (l = 25º 15' S, L = 10º 00' W)?
Show the answer
Correct answer: b) 09h 58m (20/04/2024).
Why it is correct
From 30º 30′ E to 10º 00′ W is 40º 30′ westwards, equal to 2h 42m earlier. Subtracting 2h 42m from 12h 40m on 20 April gives 09h 58m on the same day, 20/04/2024.
Why the others are not
- a) Adds 2h 42m as if B lay east of A.
- c) Adds 2h 42m and also steps back a day without reason.
- d) Misrounds the interval and changes the date to the day before.
How to work it out in the exam
- Longitudes of opposite name add: 30º 30′ + 10º 00′ = 40º 30′ = 2h 42m.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2024 · Convocatoria de abril · CY Test 1 · question 20 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2024 · Convocatoria de abril · CY Test 2 · question 19 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.