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A person walks up a stalled escalator in...

A person walks up a stalled escalator in 90 s. When just standing on the same moving escalator, he is carried in 60 s. The time it would take him to walk up the moving escalator will be

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The correct Answer is:
3
By observation, for equal interval of time the magnitude of slope of line in x-t curve is greatest in interval 3.
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A person walks up a stalled escalator in 90 s. When standingon the same escalator, now moving, he is carried in 60 s.The time it would take him to walk up the moving escalator will be:

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Knowledge Check

  • At a metro station, a girl walks up a stationary escalator in time t_1 If she remains stationary on the escalator, then the escalator take her up in time t_2 . The time taken by her to walk up the moving escalator will be.

    A
    `(t_1 + t_2)/2`
    B
    `(t_(1)t_(2))/(t_2 - t_1)`
    C
    `(t_(1)t_(2))/(t_1 + t_2)`
    D
    `t_1 - t_2`

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