š Key Concepts
ā¢ Relationship between speed, time, and distance: ( \text{Speed} = \frac{\text{Distance}}{\text{Time}} )
ā¢ How to find fuel consumption per hour (or per mile) from a known run
ā¢ Adjusting fuel usage when speed changes but fuel rate is assumed proportional to power/speed for this type of exam problem
š Think About
ā¢ First, from the initial leg, can you find how many hours the ship steamed using 850 tons of fuel?
ā¢ Once you know the total hours and total fuel, can you compute how many tons of fuel per hour were used at 24 knots?
ā¢ For the remaining distance at 19 knots, can you find how many hours the run will take, and then use your fuel-per-hour figure to estimate total fuel used?
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Before You Answer
ā¢ Be sure to convert distance and speed to time correctly: ( t = \frac{D}{S} ) and keep track of units (hours, miles, knots).
ā¢ Double-check that you are using fuel per hour, not fuel per mile, consistently throughout the problem.
ā¢ After you get your fuel amount, compare it to 850 tons. At a lower speed for a similar distance, should you expect more or less total fuel than was used on the first leg?