How long would it take a 4.50-kW motor to raise a 175-kg boiler to a platform 15.0 m

Question

above the floor?

Is this correct?
175*9.80*15.0/4.50

Answer 1

F = m*g = 175 * 9.8 = 1715 N. = Force of
the boiler.

Work = F*d = 1715 * 15 = 25,725 J.
4.5kw = 4500 W. = 4500J/s.

t = 25,725J. * 1s/4500J = 5.72 s.