A 3.50 - kN piano is lifted by three workers at constant speedto an apartment 25.0 m above the street using a pulley systemfastened to the roof of the building. Each worker isable to deliver 165 W of power, and the pulley system is 75%efficient (so that 25% of the mechanical energy is lost dueto friction in the pulley). Neglecting the mass of the pulley,find the time required to lift the piano from the street tothe apartment.

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