A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time t1. If he remains stationary on a moving escalator then the escalator takes him up in time t2. The time taken by him to walk up on the moving escalator will be :

Question

A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time t₁. If he remains stationary on a moving escalator then the escalator takes him up in time t₂. The time taken by him to walk up on the moving escalator will be :

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

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

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

${t_2} - {t_1}$

Solution

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