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A hoist is powered by an electric motor that draws 4.82 kilowatts of electric power. The system is 59.2% efficient (i.e., 5.92% of electric power is actually used to lift the load, the rest being wasted heat, the weight of the lifting ropes and pulleys, etc.) How long will it take this hoist to lift a 2550 kg mass to the top of a 75.4 m high building?

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