A person walks up a stalled escalator in \( 90 \mathrm{sec} \). He ...

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A person walks up a stalled escalator in \( 90 \mathrm{sec} \). He is
P carried in \( 60 \mathrm{~s} \), when standing on the same escalator

W which is now moving. The time he would take to walk up the moving escalator will be:-
(1) \( 27 \mathrm{~s} \)
(2) \( 72 \mathrm{~s} \)
(3) \( 18 \mathrm{~s} \)
(4) \( 36 \mathrm{~s} \)
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