Question

An elevator can lifts 10 people up 12 floors. Each person weighs approximately 60 kg. each floor is 3m high, and it takes 15s to reach the 12th floor from the ground floor without stopping. How much work does the elevator do? How much power does the elavator use?
work = force * distance, so assuming European conventions, where the ground floor is floor zero,

work = 60*9.8*10 * 3*12 Joules

power = work/time, so
p = work/12 Watts
W=60kg*9.8m/s= 5880kg.m/s*36m
W= 211,680 kg.m/s

P=W/t
P= 211,680kg.m/s / 15s
P= 14,112kg.m/s

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