Question

When the wind is blowing an average of 31.8 mph, a wind tower with its propellors centered at a height of 80 m off the ground is supplied with energy at a rate of 14.4 kW. A large bank of batteries collects the energy from the wind tower. If the efficiency of each object (tower, cable, battery) is 82.6%, how long will it take for the bank of batteries to collect 19.5 MJ of energy. (Express your answer in minutes.)