You have steamed 463 miles at 19 knots and burning 440 barrels of fuel per day. You must decrease your consumption to 200 barrels per day with 410 miles left in your voyage. What must you reduce your speed (kts) to in order to burn this amount of fuel?

Correct Answer: Option C — 13.6

Based on Bowditch's fuel and speed formulas, consumption varies with the cube of speed. Calculating the proportional relationship between the remaining distance, usable fuel burn rates, and initial speed of 19 knots determines the reduced speed must be set to 13.6 knots.