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匿名 發問於 教育及參考書小學及中學教育 · 2 月前

How to do , thanks !?

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Thank you very much --- SC147

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  • 匿名
    2 月前
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    5 | 25 45 75

     --------------

    5 | 5 9 15 

     --------------

    3 | 1 9 3

     ------------

      1 3 1

    ∴ L.C.M. of 25,45,75 = 5x5x3x3 = 225

    So, ferries set off at the same time every 225 min.,that is, 3hr. 45 min.

    => they set off at the same time again at :

    10 a.m.+3hr. 45 min., 10 a.m.+7hr. 30 min. & 10 a.m.+11hr. 15 min.

    i.e. 1:45 p.m., 5:30 p.m. & 9:15 p.m.   

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