🔍 Key Concepts

• Relationship between fuel consumption and speed for the same vessel on the same run • How fuel consumption changes when speed changes (think in terms of proportions, not a simple straight line) • Using ratios to compare fuel use at two different speeds

💭 Think About

• First, set up a ratio comparing the two speeds. How does time for the same distance change when speed decreases? • If it takes longer to go the same distance at the lower speed, what does that do to total daily fuel use, assuming fuel use per hour changes with speed? • Check whether fuel consumption should go up or down when speed drops from 17.5 to 13.5 knots, and by about how much.

✅ Before You Answer

• Be sure you are comparing fuel per day at one speed to fuel per day at another speed for the SAME distance traveled. • Confirm whether you should treat the relationship as directly proportional, inversely proportional, or something else based on typical fuel vs. speed behavior. • Once you get a calculated value, verify it is reasonable: does it change by a small, medium, or large amount from 274 bbls/day when slowing from 17.5 to 13.5 knots?