Solve the given problem:
Problem: A 3.70-kN piano is lifted by three workers at a constant speed to an apartment 26.7 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 149 W of power, and the pulley system is 75.0% efficient (so that 25.0% of the mechanical energy is lost due to friction in the pulley).
Part A: Neglecting the mass of the pulley, find the time required to lift the piano from the street to the apartment.
min
I need help to find the time required to lift the piano from the street to the apartment.