(4) 621. At a railway station, a boy walks up a stationaryescalator in time 3 s. If he remains stationary on theescalator, then the escalator take him up in time 6 sThe time taken by him to walk up on the movingescalator is- SCoa1600+ d3(1) 9 sa= 666--2m(2) 2 s(3) 1s o(l06)(4) 4.5

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