At your current speed of 23 knots you only have enough fuel remaining to travel 386 miles. You must travel 785 miles to reach your destination. What should you reduce your speed (knots) to in order to reach your destination?

Correct Answer: Option B — 16.1

Applying Bowditch fuel-speed equations where fuel consumption is proportional to the cube of speed, multiplying 23 knots by the cube root of (386 / 785) determines the exact required speed of 16.1 knots.