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Tras varias horas de navegación, nos encontramos en la bocana del puerto de Algeciras (luz roja). ¿Qué tiempo tardaremos en llegar a Ceuta (luz verde), si nuestra velocidad es de 12 nudos?.Positioned at the entrance of Algeciras port (red breakwater light), how long will it take to reach Ceuta (green entrance light) at a speed of 12 knots?
Show the answer
Correct answer: b) 1h 21m
Why it is correct
The direct charted distance between Algeciras red port light (36º 07.5′ N, 005º 25.4′ W) and Ceuta green entrance light (35º 53.8′ N, 005º 18.6′ W) is 16.2 miles. At 12 knots this takes (16.2 / 12) × 60 = 81 minutes = 1h 21m.
Why the others are not
- a) Does not match the time needed to cover 16.2 miles at 12 knots (1h 21m).
- c) Does not match the time needed to cover 16.2 miles at 12 knots (1h 21m).
- d) Does not match the time needed to cover 16.2 miles at 12 knots (1h 21m).
How to work it out in the exam
- Measure on the chart the distance between Algeciras and Ceuta entrances: 16.2 miles.
- Divide by 12 knots: 16.2 / 12 = 1.35 h = 1h 21m.
Where this question comes from
- Región de Murcia · 2021 · 1ª convocatoria · PER Tipo 1 · question 45 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.