8.A person walk up a stationary escalator in time t1s.If he is standing on moving escalator then it carries him up in t2s.If the length of escalator is l then time taken,if man move down the moving escalator is

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A person walks up a stationary escalator in $t_{1}$ second. If he remains stationary on the escalator, then it can take him up in $t_{2}$ second. If the length of the escalator is L, then how much time would it take him to walk up the moving escalator?

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