Physics.. horsepower..?

Question

a 75 kg girl runs up a 3m flight of stairs in 2.5s. What is her 'horsepower' in this situation?

note:make it as simple as possible, using equations such as P=w/t, etc.

Answer 1

F = mg

F = 75kg(9.8m/s^2)

F = 735kg.m/s^2 = 735N

W = Fd = 735N(3m) = 2,205J

P = W/t = 2,205J/2.5s = 882J/s

P = 882 watts

1hp = 746 watts so it's 1.1823 hp