Your ship has steamed 1945 miles at 21 knots using 635 tons of fuel oil. The distance remaining to your next port is 1750 miles. If you decrease speed to 16 knots, how much fuel will be used to reach that port?
• Fuel consumption vs. speed (how fuel use changes when speed changes) • Using proportions or ratios based on miles steamed and tons of fuel used • Relationship between distance, speed, and time: Speed = Distance / Time
• First, find how many tons of fuel are used per mile at the original speed. • Then think about how changing speed from 21 knots to 16 knots might change the fuel rate per mile or per hour (depending on the assumption you make). • Decide whether you should assume fuel use is proportional to speed, speed squared, or time, based on typical exam assumptions.
• Be clear whether you are working in tons per hour or tons per mile and stay consistent. • Check that the total time at the new speed to cover 1750 miles is reasonable using ( \text{Time} = \frac{\text{Distance}}{\text{Speed}} ). • After calculating fuel for the remaining leg, compare it to the original 635 tons used; the new amount should be reasonable, not drastically larger than what was already burned for a similar distance.
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