Mathematics

Problem

A person climbs up a stalled escalator in

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? a.

37 \text{ s}

27 \text{ s}

24 \text{ s}

45 \text{ s}