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Situados en posición A: Latitud: 36º00’N / Longitud: 5º20’W, ponemos rumbo a posición B, situada a 5 millas de Punta Cires y 5 millas del Faro de la Isla de Tarifa. ¿Qué tiempo tardaremos en llegar a la posición B, si nuestra velocidad es de 10 nudos?.From position A (36º 00' N, 005º 20' W) you head for position B (located 5 miles from Punta Cires and 5 miles from Isla de Tarifa lighthouse) at 10 knots. How long will it take to reach B?
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Correct answer: d) 51 minutes
Why it is correct
The intersection of the 5-mile arcs from Punta Cires and Isla de Tarifa defines point B at 35º 59.3′ N, 005º 30.5′ W. From A (36º 00′ N, 005º 20′ W) to B is 8.5 miles, taking (8.5 / 10) × 60 = 51 minutes at 10 knots.
Why the others are not
- a) Does not match the 8.5 miles between A and B covered at 10 knots (51 minutes).
- b) Does not match the 8.5 miles between A and B covered at 10 knots (51 minutes).
- c) Does not match the 8.5 miles between A and B covered at 10 knots (51 minutes).
How to work it out in the exam
- Find B by intersecting 5-mile arcs from Punta Cires and Isla de Tarifa (35º 59.3′ N, 005º 30.5′ W).
- Measure the distance from A (8.5 miles) and compute the time at 10 knots: 51 minutes.
Where this question comes from
- Región de Murcia · 2021 · 1ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.