A person walks up a stalled long escalator in

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A person walks up a stalled

15\text{ m}

long escalator in

90\text{ s}

. When standing on the same escalator, now moving, the person is carried up in

60\text{ s}

. How much time would it take that person to walk up the moving escalator? Does the answer depend on the length of the escalator?