From the information given,
The average passenger's mass is 54.9 kg
Force exerted by each passenger = weight of passenger = mg
where
m = mass = 54.9
g = acceleration due to gravity = 9.8m/s^2
Force = weight = 54.9 x 9.8 = 538.02 N
We would determine the work done in moving one passenger. The formula for calculating work is
work = force x distance
distance = 5.2
Work = 538.02 x 5.2 = 2797.704 J
Work done in moving 20 passengers = 2797.704 x 20 = 55954.08
Recall,
Power = work/time
Given that time = 60s,
Power = 55954.08/60
Power = 933 W
the power requirement of the escalator in order to move this number of passengers in this amount of time is 933 W