Answer:
The escalator disposes 58 passengers each hour.
Step-by-step explanation:
The velocity diagram of the escalator is shown in the attached figure
We can obtain the vertical distance that the escalator moves in 1 hour as

Thus in 1 hour the last thread moves 1720.73 cm
Now it is given that 1 thread = 600 mm =60 cm
Thus the number of times the last thread moves equals

Since each time last thread moves it disposes 2 passengers thus the number of passengers disposed when the thread moves 28.68 times equals

Thus the escalator disposes 58 passengers each hour.