Preeti reached the metro station and found that the escalator was not working. She walked up the sationary escalator in time t1. On another days, if she remains stationary on the 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 sationary escalator in time t₁. On another days, if she remains stationary on the 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

${{{t_1}{t_2}} \over {{t_2} - {t_1}}}$

${{{t_1}{t_2}} \over {{t_2} + {t_1}}}$

${{t_1} - {t_2}}$

${{{t_1} + {t_2}} \over 2}$

Solution

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