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A HRB (hora de reloj de bitácora)= 1030, estamos situados a 5 millas al Este verdadero del faro de Punta Europa. Calcular a que HRB llegaremos al puerto de Ceuta con velocidad de 9 nudos.At HRB = 1030 you are positioned 5 miles due East true of Punta Europa lighthouse. Calculate your arrival time (HRB) at Ceuta port at a speed of 9 knots:
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Correct answer: a) HRB = 1158
Why it is correct
From 5 miles due East of Punta Europa (36º 06.5′ N, 005º 14.5′ W) to Ceuta harbour entrance (35º 53.8′ N, 005º 18.6′ W) is 13.2 miles. At 9 knots this takes (13.2 / 9) × 60 = 88 minutes (1h 28m), arriving at HRB = 10:30 + 1h 28m = 11:58.
Why the others are not
- b) Does not add 1h 28m (13.2 miles at 9 knots) to the 10:30 departure time.
- c) Does not add 1h 28m (13.2 miles at 9 knots) to the 10:30 departure time.
- d) Does not add 1h 28m (13.2 miles at 9 knots) to the 10:30 departure time.
How to work it out in the exam
- Plot the point 5 miles East of Punta Europa and measure the distance to Ceuta: 13.2 miles.
- Divide by 9 knots (1h 28m) and add to 10:30 ⇒ HRB = 1158.
Where this question comes from
- Región de Murcia · 2019 · 2ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.