An electric motor that drives a lift delivers an output power of $20\,\text{kW}$. Together, the lift and its passengers have a total mass of $1500\,\text{kg}$. The motor lifts the lift at constant speed over a distance of $20\,\text{m}$. How long does this take?
- A$6\,\text{s}$
- B$15\,\text{s}$
- C$30\,\text{s}$
- D$60\,\text{s}$