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The traffic lights at three different road crossings change

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The traffic lights at three different road crossings change [#permalink] New post 07 Jul 2004, 12:17
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The traffic lights at three different road crossings change after every 48s, 72s, and 108s respectively. If they all change simultaneously at 08:20:00hrs, then at what time will they again change simultaneously?

<An easy one here!>
Director
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 [#permalink] New post 07 Jul 2004, 12:45
That's correct.

As this is simple enough....I am publishing the answer right away
(LCM of 48,72 and 108...add this to 8:20 AM)
  [#permalink] 07 Jul 2004, 12:45
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