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Estamos en posición = 35º 58' N – 005º 50' W y vamos a navegar hasta el Puerto de Barbate (entrada por luz roja del extremo del espigón). Indique la velocidad a la que debemos navegar en una hora y media.From position 35º 58' N – 005º 50' W you sail to Barbate port (entering by the red light at the end of the breakwater) in 1.5 hours. What speed must you maintain?
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Correct answer: b) 9 knots
Why it is correct
The charted distance from 35º 58′ N, 005º 50′ W to Barbate breakwater red light (36º 11.3′ N, 005º 55.3′ W) is 13.5 miles. Covering 13.5 miles in 1.5 hours requires speed V = 13.5 / 1.5 = 9 knots.
Why the others are not
- a) Does not match dividing the 13.5 miles to Barbate by 1.5 hours.
- c) Does not match dividing the 13.5 miles to Barbate by 1.5 hours.
- d) Does not match dividing the 13.5 miles to Barbate by 1.5 hours.
How to work it out in the exam
- Measure the distance from 35º 58′ N, 005º 50′ W to Barbate red light: 13.5 miles.
- Divide by 1.5 hours: V = 13.5 / 1.5 = 9 knots.
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.