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Situados, a HRB: 10h55m, en la línea que une Cabo Espartel y Cabo Trafalgar y a 10 millas del puerto de Barbate (extremo muelle), ponemos rumbo verdadero al puerto de Tánger. ¿A qué hora llegaremos a Tánger si nuestra velocidad es de 12 nudos?At HRB 10h 55m on the line joining Cape Spartel and Cape Trafalgar at 10 miles from Barbate pier head, you head for Tangier port at 12 knots. At what time will you arrive?
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Correct answer: b) 12h 19m
Why it is correct
The 10-mile arc from Barbate pier head intersects the Cape Spartel–Cape Trafalgar line at 36º 03.7′ N, 005º 59.9′ W. From there to Tangier port (35º 47.4′ N, 005º 48.2′ W) is 16.8 miles, taking 1h 24m at 12 knots ⇒ 10h 55m + 1h 24m = 12h 19m.
Why the others are not
- a) Does not add 1h 24m (16.8 miles at 12 knots) to the 10h 55m departure time.
- c) Does not add 1h 24m (16.8 miles at 12 knots) to the 10h 55m departure time.
- d) Does not add 1h 24m (16.8 miles at 12 knots) to the 10h 55m departure time.
How to work it out in the exam
- Intersect the Spartel–Trafalgar line with a 10-mile arc from Barbate (36º 03.7′ N, 005º 59.9′ W).
- Measure distance to Tangier (16.8′) and time at 12 knots (1h 24m): 10h 55m + 1h 24m = 12h 19m.
Where this question comes from
- Región de Murcia · 2025 · 1ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
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