1. Preeti reached the metro station...
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1. Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time ty. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time to. The time taken by her to walk up on the moving escalator will be [NEET-2017] tat2 (2) Ez-t, titz (3) 12+th (4) t - ta

NEET/Medical Exams
Physics
Solution
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( V_{1} rightarrow ) velocity of Preeti ( mathrm{V}_{2} rightarrow ) velocity of escalator ( ell rightarrow ) distance ( t=frac{ell}{V_{1}+V_{2}}=frac{ell}{frac{ell}{t_{1}}+frac{ell}{t_{2}}}=frac{t_{1} t_{2}}{t_{1}+t_{2}} )
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