Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time 
. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time 
. The time taken by her to walk up on the moving escalator will be
Text Solution
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Let 
is the velocity of Preeti on stationary escalator and 
is the distance travelled by her
Again, let 
is the velocity of escalator
Net velocity of Preeti on moving escalator with respect to the ground
The time taken by her to walk up on the moving escalator will be
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