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Q.

A person climbs up a stalled escalator in 60sec. When he stands on it then he is carried in the moving escalator in 30sec. How much time will he take in climbing up in a moving escalator?

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a

10 sec

b

30 sec

c

20 sec

d

40 sec

answer is C.

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Detailed Solution

detailed_solution_thumbnail

Velocity of escalator v1=x30m/sec

Velocity of person v2=x60m/sec

t=xv1+v2=xx30+x60=20sec

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