At your current speed of 22 knots you only have enough fuel remaining to travel 440 miles. You must travel 618 miles to reach your destination. What should you reduce your speed (knots) to in order to reach your destination?

Correct Answer: Option A — 18.6

Fuel consumption varies approximately with the cube of the speed for displacement vessels. Using fuel proportionality, New Speed = Current Speed × (Remaining Distance / Required Distance)^(1/3), yielding 22 × (440 / 618)^(1/3) = 18.6 knots as outlined in marine engineering voyage planning principles.