A person walks up a stalled escalator in \( 90 \mathrm{~s} \). When...

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A person walks up a stalled escalator in \( 90 \mathrm{~s} \). When standing on the same escalator, now moving, he is carried in
\( \mathrm{P} \) \( 60 \mathrm{~s} \). The time it would take him to walk up the moving escalator

W will be :
(A) \( 27 \mathrm{~s} \)
(B) \( 72 \mathrm{~s} \)
(C) \( 18 \mathrm{~s} \)
(D) \( 36 \mathrm{~s} \)
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