If your vessel burns 2.9 tons of fuel per hour operating at a speed of 20 knots, how many tons per hour will it burn at a speed of 15 knots?
β’ Fuel consumption vs. speed (how fuel use changes when speed changes) β’ Relationship between speed and time per mile β’ How to use ratios or proportions when one variable changes and another depends on it
β’ How many nautical miles per hour is the vessel traveling at 20 knots compared to 15 knots? β’ If it takes more time to travel one mile at a lower speed, how does that affect the fuel burned per hour, assuming the fuel burned per mile stays the same? β’ Can you set up a proportion using fuel per hour and speed to find the new fuel rate at 15 knots?
β’ Compute fuel burned per nautical mile at 20 knots before changing speeds β’ Use a proportion that keeps fuel per mile constant when changing from 20 to 15 knots β’ Double-check units: make sure you are comparing tons per hour to knots (nautical miles per hour) consistently
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