An engine drives a water pump. In $1.0\text{ minute}$, the pump lifts $0.50\text{ m}^3$ of water from a depth of $30\text{ m}$. The pump operates with an efficiency of $70\%$. The density of water is $1000\text{ kg m}^{-3}$. What is the useful output power from the engine?
- A$2.5\text{ kW}$
- B$3.5\text{ kW}$
- C$150\text{ kW}$
- D$210\text{ kW}$