12 thoughts on “Escalators – 2

    • In CAT, even this level questions have rarely come. A XAT is more likely to ask something on these lines (or occasionally tougher); in areas like Arithmetic and Probability XAT often goes a fair bit tougher than CAT. CAT would go tough in Numbers and Functions…

      regards
      J

  1. sir,
    B climbs effectively 2 steps forward in 4 s. Can’t we consider his effective speed to be 0.5 steps/s? If that is true then the number of steps he climbs in 118 s will be 59 steps. Where is the conceptual flaw?

    • Because it is not a constant speed. Some time he is moving forward, som time backward. Direct scaling (unitary approach) will work here only if the time is a multiple of his complete cycle time (the time after which his actions repeat, in this case 4 seconds)

      regards
      J

  2. Sir, in the first problem
    We are doubling 18steps to make it 36 and dividing it by n-36 . Then why aren’t we dividing 30*2 by n-60?

    • You are misreading the RHS 🙂 The thought process is not (2 x 30)/(n-30). It is basically 2 x [30/(n-30)] implying that the second case speed is 2 x (first case speed).

      regards
      J

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