231. You have steamed 525 miles at 16.0 knots, and consumed 105 tons of fuel. If you have 308 tons of usable fuel remaining, how far can you steam at 19 knots?

Fuel consumption per mile increases with the square of speed; at 19 knots, fuel per mile is higher than at 16 knots. With 308 tons of remaining fuel, the ship can steam approximately 1092 miles.