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Math Help - time intervals

  1. #1
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    Question time intervals

    I have the answers; however, don't know how they came up with them.

    Suppose a fountain has one shooter that shoots water every 3 seconds and another that goes off every 8 seconds. How long after the fountain is turned on will both shooters go off at the same time?

    A third shooter shoots water every 16 seconds. Suppose all three shooters just went off together. How many seconds will pass before all three go off again at the same time?
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  2. #2
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    I wrote down the eight times table and the first number that three will divide by is 24. So after 24 seconds they will go off together.

    The first number in the 16 times table that 8 and 3 will divide by is 48. So if they all go off together then it will be 48 seconds before they all fire again at the same time.
    Last edited by futureprof; September 9th 2009 at 04:13 PM. Reason: silly mistakes
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  3. #3
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    The answers that were provided were

    24 seconds for the 2 shooters (1st part of question)

    and

    48 seconds for the 3 shooters (2nd part of question).

    **Sorry; guess I should have given my answers before.**
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  4. #4
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    Hi

    I have edited my first post and put in the correct values.

    The method still stands but my math was rubbish.

    It's been a long day
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  5. #5
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    Thumbs up

    I greatly appreciate your time and explanation.
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