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Q.

A person walks up a stalled escalator in 90 seconds. When standing on the same escalator, now moving, he is carried in 60 seconds. The time he would take to walk up the moving escalator will be

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a

27s

b

72s

c

18s

d

36s

answer is D.

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Detailed Solution

Concept: In this question, we will be discussing relative velocity and relation of speed, distance and time.
Given,
Time to travel by man in steady escalator = 90s
Time to travel by man in moving escalator = 60s
Let the distance travelled be D.
We know that

Since, on travelling in a moving escalator, speeds will add up. So,
Question Image

Question Image

So, option (4) is correct and time taken now is 36 sec.

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