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[" 26.Preeti reached the metro station a...

[" 26.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 her up in "],[" time "t_(2)" .The time taken by her to walk up on the moving "],[[" (a) "(t_(1)+t_(2))/(2)," (b) "(t_(1)t_(2))/(t_(2)-t_(1))],[" Where "(t_(1)t_(2))/(t_(2)+t_(1))," (d) "t_(1)-t_(2)]]

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