A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15m high

Mass of the boy, (m1) = 40 kg
Mass of the box, (m2) = 20 kgHeight, (h) = 15 m

Acceleration due to gravity, (g) = 10 m/s2 

M = m1 + m2

= 360 W

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a boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 sec. calculate the power.