Chart Navigation & Plotting · Distance, Speed & Time
At 10 knots, how long does it take to run 25 nautical miles?
- A2 hours 0 minutes
- B2 hours 30 minutes✓ Correct
- C2 hours 50 minutes
- D3 hours 0 minutes
Explanation
Time = distance ÷ speed = 25 ÷ 10 = 2.5 hours = 2 hours 30 minutes. Equivalently 60D/S = (60 × 25)/10 = 150 minutes.
Authority: Bowditch, Pub. No. 9 (speed-time-distance)
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