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Thread: Escalator....

  1. #1
    Expert Member
    Join Date
    May 2009
    Answers
    1,374

    Smile Escalator....

    Hi Friends,


    You walk upwards on an escalator, with a speed of 1 step per second.

    After 50 steps you are at the end.

    You turn around and run downwards with a speed of 5 steps per second.

    After 125 steps you are back at the beginning of the escalator.

    Question:

    How many steps do you need if the escalator stands still?


    Try................

    Regards,

    Riju


  2. #2
    Contributing Member
    Join Date
    May 2009
    Answers
    49

    Lightbulb Re: Escalator....

    Good Puzzle:
    Assumption:
    The escalator is moving upward with a speed of 1 step per second.

    1) Now you are going up with a speed of 1 step per second and escalator too is going upward with a speed of 1step per second. So ideally if it were still you would had to climb 100 steps

    2) You can confirm this by:
    Now you are coming down at a speed of 5 steps per second, so you should have covered 100 steps, but at the same time escalator is moving upward at a speed of 1 step per second, and it took you additional 25 steps to come down because when you were taking 5 steps, you were actually taking only 4 steps. So 100/4= 25. That's the reason you had to take additional 25 steps.

    Plz confirm the ans as you did earlier, rijus.

    Thanks.


  3. #3
    Expert Member
    Join Date
    May 2009
    Answers
    1,374

    Re: Escalator....

    vcite,

    That's t answer.

    If the escalator stands still u need 100 steps t o reach.

    Congrats..

    Thanks,
    Riju.


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