Your ship has steamed 1856 miles at 18 knots using 545 tons of fuel oil. The distance remaining to your next port is 1978 miles. If you increase speed to 22 knots, how much fuel will be used to reach that port?
• Fuel consumption vs. speed relationship (fuel per mile changes with speed, not fuel per hour alone) • How to calculate consumption per mile from the first leg of the voyage • Using a proportion or ratio to estimate new consumption at a higher speed
• From the first part of the trip, what is the ship’s fuel consumption per mile at 18 knots? • Does fuel used depend more directly on time steaming or distance steamed in this type of exam question? How can you express it both ways and compare? • How can you adjust or scale the known consumption so it matches the new speed (22 knots) before applying it to the remaining distance?
• Be sure you convert miles, knots, and hours consistently when you work with time and distance. • Double‑check that the fuel rate you apply to the second leg is appropriate for 22 knots, not just copied from 18 knots. • After you get a fuel amount, add it to the original 545 tons and see if the total fuel for the whole voyage seems reasonable for the total distance.
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