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  • Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time  

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time  t_{1} . On other days, if she remains stationary on the moving escalator, then the escalator takes up in time t_{2}. The time taken by her to walk up on the moving escalator will be

Option: 1

\frac{{{t}_{1}}{{t}_{2}}}{{{t}_{2}}-{{t}_{1}}}


Option: 2

\frac{{{t}_{1}}{{t}_{2}}}{{{t}_{2}}+{{t}_{1}}}


Option: 3

{{t}_{1}}-{{t}_{2}}


Option: 4

\frac{{{t}_{1}}+{{t}_{2}}}{2}


Answers (1)

best_answer

Let v_{1} is the velocity of Preeti on a stationary escalator and d is the distance traveled by her.

\therefore {{v}_{1}}=\frac{d}{{{t}_{1}}}

Again, let {{v}_{2}} is the velocity of the escalator 

\therefore {{v}_{2}}=\frac{d}{{{t}_{2}}}

\therefore Net velocity of Preeti on moving escalator will be

Posted by

Riya

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