A particular long-range drone is designed without landing gear. It has an empty weight of 4 metric tons and a fuel capacity of 720 kg. When fuel is exhausted, the drone gets dumped in the ocean. The drone has a single engine that produces 2250 Ibf with a fuel flow of 0.25 kg/s at an altitude of 40,000 ft with a flight speed of 180 knots. If the L/D ratio of the aircraft at cruising speed is 22:1, estimate the maximum range of the drone. Please express your answer in units of furlongs