If your vessel burns 4 tons of fuel per hour...

Question 1 / 205eccef9dbacbc34ba4d45dd4

Question 1 of 205eccef9dbacbc34ba4d45dd4

If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots?

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Question 1 of 20

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If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots?

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🔍 Key Concepts

• Relationship between speed and fuel consumption for displacement vessels • How fuel consumption changes when speed changes (think in terms of ratios, not subtracting) • Proportional reasoning using Speed^3 for fuel use on many exam problems

💭 Think About

• First, find the ratio between the original speed and the new speed. How much slower is 16 knots compared to 21 knots as a fraction? • If fuel use is assumed to vary with the cube of the speed, how would you adjust the fuel consumption from 21 knots down to 16 knots using that ratio? • Once you compute the new tons per hour, which option is numerically closest to your result?

✅ Before You Answer

• Be sure you are changing fuel use by a multiplication factor, not by simple subtraction of tons per hour • Carefully compute the speed ratio (16/21) and apply the cube relationship correctly • After calculating, compare your result with each choice and pick the closest match

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Question 1 of 20

If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots?

3.0 tons

5.3 tons

2.3 tons

1.8 tons

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