An electric motor that drives a lift delivers an output power of $20\,\text{kW}$. The lift together with its passengers has a total mass of $1500\,\text{kg}$. The motor lifts the lift by a vertical distance of $20\,\text{m}$. How long is required?
- A$6\,\text{s}$
- B$15\,\text{s}$
- C$30\,\text{s}$
- D$60\,\text{s}$