A person climbs up a stalled escalator in

MATHEMATICS · Single correct · AoPS · Mathematics · Proportion · Proportion

Problem

60 \text{ s}

. If standing on the same escalator while it runs with constant velocity, he takes

40 \text{ s}

. How much time is taken by the person to walk up the moving escalator? (1)

37 \text{ s}

(2)

27 \text{ s}

(3)

24 \text{ s}

(4)

45 \text{ s}