The visible part of an Escalator
In a metro station, Ossama used the escalator to climb up to the ground floor, upon his arrival to the ground floor he changed his direction moving down to the station floor using the escalator. How many visible stairs of the escalator can you see at any time, Given that:
Ossama moves at the same speed, whether going down or going up.
The number of steps he did to climb the escalator = 31 stairs step
The number of steps he did while going down opposite to the escalator movement = 127 stairs step
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