Navigation General · Time-Speed-Distance
A vessel must travel 120 nautical miles and arrive exactly 10 hours from now. What speed is required?
- A12 knots✓ Correct
- B10 knots
- C15 knots
- D8 knots
Explanation
S = D / T = 120 nm / 10 hr = 12 knots. Using the 60D=ST formula: S = (60 × D) / T(min) = (60 × 120) / 600 = 7200 / 600 = 12 knots.
Authority: Bowditch (Pub. 9), Ch. 7
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