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Posted by on Tuesday, June 26, 2012 at 11:15pm.

One light flashes every 2 minutes and another light flashes every 3.5 minutes. Suppose both lights flash together at noon. What is the first time after 1 PM that both lights will flash together ?

  • MATH - , Wednesday, June 27, 2012 at 7:42am

    2 4 6 8 10 12 14 16 18 .....
    3.5 7 10.5 14 17.5 ...

    looks like they are together (in sync) at
    12:14 12:28 12:42 12:56 1:10 1:24 ....

    so the first time after 1:00 will be at 1:10

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