Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time $$t1$$. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time $$t2$$. The time taken by her to walk up on the moving escalator will be :

Question

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time $$t1$$. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time $$t2$$. The time taken by her to walk up on the moving escalator will be :

Infinity Learn · Accepted Answer

Velocity of Preeti w.r.t elevator $$=$$ $$lt1Velocity$$ of elevator w.r.t ground $$=$$ $$lt2Then$$ velocity of girl w.r.t groundv→preeti  $$=$$  v→preeti,$$elevator+v$$→elevatorlt $$=$$ $$lt1+lt2$$⇒ t $$=$$ $$llt1+lt2$$ $$=$$ $$t1t2t1+t2$$

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