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    Ina_Shippy's Avatar
    Ina_Shippy Posts: 1, Reputation: 1
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    #1

    Sep 17, 2009, 08:04 PM
    How long will it take?
    There are 14 students in a class. If one student tells another student a message. 5 Minutes later each student that knows the message tells a new student. How long will it take for the class to know the message?
    mudweiser's Avatar
    mudweiser Posts: 2,750, Reputation: 707
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    #2

    Sep 17, 2009, 10:04 PM

    About an hour.

    Sarah
    Rhiannnonn's Avatar
    Rhiannnonn Posts: 62, Reputation: 4
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    #3

    Sep 17, 2009, 11:48 PM

    20 minutes
    Rhiannnonn's Avatar
    Rhiannnonn Posts: 62, Reputation: 4
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    #4

    Sep 17, 2009, 11:51 PM
    No! 15 minutes!
    kaalvoetkind's Avatar
    kaalvoetkind Posts: 37, Reputation: 3
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    #5

    Sep 18, 2009, 12:13 AM

    Less than 20 but more than 15...
    Only 8 kids are going to know at the end of 15 so 20 then
    ROLCAM's Avatar
    ROLCAM Posts: 1,420, Reputation: 23
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    #6

    Jan 7, 2010, 06:07 AM

    It will take 20 minutes for the
    14 to know the message.
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #7

    Jan 7, 2010, 06:46 AM
    If one child is told the message every 5 minutes, it will take 70 minutes.

    14 children x 5 minutes each child = 70 minutes.
    NeedKarma's Avatar
    NeedKarma Posts: 10,635, Reputation: 1706
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    #8

    Jan 7, 2010, 07:01 AM
    J9, it's not sequential, it's exponential.
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #9

    Jan 7, 2010, 07:02 AM
    Quote Originally Posted by NeedKarma View Post
    J9, it's not sequential, it's exponential.
    Oh, sorry... just got off work... brain not functioning properly. :o
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #10

    Jan 7, 2010, 07:06 AM
    I should know better than to do mathematical questions after a 12 hour shift.
    NeedKarma's Avatar
    NeedKarma Posts: 10,635, Reputation: 1706
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    #11

    Jan 7, 2010, 07:37 AM
    Sleep! I remember when I did 4 on/4 off 12hour shifts, days then nights. Crazy on the system. :)
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #12

    Jan 7, 2010, 07:44 AM
    Quote Originally Posted by NeedKarma View Post
    Sleep! I remember when I did 4 on/4 off 12hour shifts, days then nights. Crazy on the system. :)
    I typically do 4 on and 2 off. :eek: But a person who works 9 - 5 can't come home and go to bed at 5... I need some time to wind down as well. Guess I'll just stay away from simple math questions. Now, if the doc prescribes 150mg of antibiotics and all you have on hand is 375mg/2ml... I can do that in my sleep. :p
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