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- Q135 - Navigation Problems: Oceans
551. You have steamed 432 miles at 18 knots and burning 406 barrels of fuel per day. You must decrease your consumption to 221 barrels per day with 190 miles left in your voyage. What must you reduce your speed (kts) to in order to burn this amount of fuel?
The correct speed is 20 knots. This is determined by applying the propeller law (fuel consumption proportional to the cube of speed) to the remaining distance and fuel allowance, resulting in a quadratic equation that yields a solution of approximately 20 knots.
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