17 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…


  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)


  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).


  3. Sir,

    why in first question, we can’t compare his normal speed? e.g. 18/n-18 = 30/n-30.
    I know above written expression is dead expression, but still I am not able to deny it.
    Can you please help me understand it ?

  4. Sir,In the second question,the net effect of his speed is 2F,like essentially he takes 2 steps so why cant be divide 118 by 2 to get his distance traveled?

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