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Zarpamos del puerto de Tánger con rumbo a un punto de la carta situado a 10’ al Norte verdadero de Cº Espartel. Nuestra velocidad es de 7’. Calcule cuánto tiempo tardaremos en llegar a dicho punto.Departing Tangier port bound for a charted point 10' due North true of Cape Spartel at a speed of 7 knots, how long will the run take?
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Correct answer: c) 1h 41m
Why it is correct
From Tangier port (35º 47.4′ N, 005º 48.2′ W) to the point 10 miles due North of Cape Spartel (35º 57.5′ N, 005º 55.5′ W) is 11.8 miles. At 7 knots this takes (11.8 / 7) × 60 = 101 minutes = 1h 41m.
Why the others are not
- a) Does not match the time to cover 11.8 miles at 7 knots (1h 41m).
- b) Does not match the time to cover 11.8 miles at 7 knots (1h 41m).
- d) Does not match the time to cover 11.8 miles at 7 knots (1h 41m).
How to work it out in the exam
- Plot the point 10′ North of Cape Spartel (35º 57.5′ N, 005º 55.5′ W) and measure the distance from Tangier: 11.8 miles.
- Divide by 7 knots: 11.8 / 7 = 1.685 h = 1h 41m.
Where this question comes from
- Región de Murcia · 2020 · 2ª convocatoria · PER Tipo 1 · question 42 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.