A student works out his power when running up a staircase. He measures the vertical height of the stairs, the time taken to run up them and his weight. How does he calculate his power?
- A$\text{height} \times \text{time} \times \text{weight}$
- B$\frac{\text{height} \times \text{weight}}{\text{time}}$
- C$\frac{\text{time} \times \text{weight}}{\text{height}}$
- D$\frac{\text{weight}}{\text{height} \times \text{time}}$