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Calcular la velocidad a poner para hacer el recorrido desde el Puerto de Barbate (luz extremo espigón) hacia el Puerto de Tánger (luz extremo del espigón) en 2h30m:Calculate the speed required to make the passage from Barbate port (breakwater end light) to Tangier port (breakwater end light) in 2h 30m:
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Correct answer: b) 9.7 knots
Why it is correct
The direct charted distance between Barbate breakwater (36º 11.3′ N, 005º 55.3′ W) and Tangier breakwater (35º 47.4′ N, 005º 48.2′ W) is 24.3 miles. Covering 24.3 miles in 2.5 hours requires V = 24.3 / 2.5 = 9.72 ≈ 9.7 knots.
Why the others are not
- a) Does not match dividing the 24.3 miles between Barbate and Tangier by 2.5 hours.
- c) Does not match dividing the 24.3 miles between Barbate and Tangier by 2.5 hours.
- d) Does not match dividing the 24.3 miles between Barbate and Tangier by 2.5 hours.
How to work it out in the exam
- Measure on the chart the distance between Barbate and Tangier entrances: 24.3 miles.
- Divide by 2.5 hours: V = 24.3 / 2.5 = 9.7 knots.
Where this question comes from
- Región de Murcia · 2022 · 2ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.