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A person walks up a stalled escalator in...

A person walks up a stalled escalator in 90 s. When standingon the same escalator, now moving, he is carried in 60 s.The time it would take him to walk up the moving escalator will be:

A

27 s

B

50 s

C

18 s

D

36 s

Text Solution

Verified by Experts

The correct Answer is:
D
`upsilon_(1)=(s)/(90), upsilon_(2)=(s)/(60)`
Now, `t=(s)/(upsilon_(1)+upsilon_(2))=(s)/((s)/(90)+(s)/(60))=(90xx60)/(90+60)=36s`
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DC PANDEY-MOTION IN A PLANE-(A) Taking it together
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