Your ship has steamed 1786 miles at 17 knots using 515 tons of fuel oil. The distance remaining to your next port is 1922 miles. If you increase speed to 20 knots, how much fuel will be used to reach that port?
• Fuel consumption rate in tons per mile based on the first leg of the voyage • Relationship between speed and fuel consumption at sea (often approximated by a power of speed) • Keeping units consistent (knots, miles, tons) through the whole calculation
• First, find how many tons of fuel were used per mile at 17 knots on the 1786‑mile leg. What number do you get? • Ask yourself: does fuel use usually change directly with speed, with square of speed, or with something else? How would that affect consumption when going from 17 to 20 knots? • Once you adjust the consumption rate for 20 knots, how do you turn that into total tons for the 1922‑mile remaining leg?
• Be sure you calculate the original consumption rate correctly: total tons ÷ total miles. • Confirm you’re applying the correct relationship between speed and fuel consumption that is commonly assumed in exam problems (not just simple linear). • After computing, check if your fuel figure is reasonable compared to 515 tons used for 1786 miles at the lower speed.
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