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At a metro station, a girl walks up a stationary escalator in time t1. If she remains stationary on the escalator, then the escalator take her up in time t2. The time taken by her to walk up on the moving escalator will be

(a) (t1 + t2)/2

(b) t1t2/(t2 – t1)

(c) t1t2/(t2 + t1)

(d) t1 – t2 

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(c) t1t2/(t2 + t1)

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