Your vessel arrives in port with sufficient fuel to steam 1175 miles at 19 knots. If you are unable to take on bunkers, at what speed must you proceed to reach your next port, 1341 miles distant?

Correct Answer: Option B — 17.8 knots

To successfully extend steaming radius without bunkering, speed must be reduced per the cubic fuel law. Multiplying 19 knots by the cube root of (1175 / 1341) calculates a necessary speed of 17.8 knots.