Question

You’re using a winch to lift supplies that weigh 2380 N a distance of 6.80 meters. How much time does it take an 820 Watt motor to lift these supplies?

Answer 1

The power

$$P=\frac{work \; done}{time}=\frac{Fd}{t}$$

Hence, the time

$$t=\frac{Fd}{P}=\frac{2380*6.80}{820}=19.7\:\rm s$$