While steaming at 15 knots, your vessel burns 326 bbls of fuel per day. What will be the rate of fuel consumption if you decrease speed to 12.2 knots?

Correct Answer: Option D — 175 bbls

Ship's fuel consumption varies directly as the cube of the speed ratio per standard marine engineering principles. Using the formula $F_2 = F_1 \times (V_2 / V_1)^3$, substituting 326 bbls and speeds 15 and 12.2 knots yields 175 bbls per day.