If a man runs up a staircase of height h in time t with mass m, what is the expression for his average power?

1. If a man runs up a staircase of height h in time t with mass m, what is the expression for his average power?

1. \( P = \frac{mgh}{t} \)2. \( P = \frac{t}{mgh} \)3. \( P = mgt \)4. \( P = \frac{h}{mg} \)