At your current speed of 21 knots you only have enough fuel remaining to travel 435 miles. You must travel 755 miles to reach your destination. What should you reduce your speed (knots) to in order to reach your destination?

Correct Answer: Option B — 15.9

Using the cubic speed-fuel relationship from maritime engineering principles, dividing remaining fuel distance by required distance under a cube root factor scales the initial 21 knots down to 15.9 knots.