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8 February, 12:45

Two light houses flash their lights every 30 seconds and 40 seconds respectively. Given that they flashed together at 10:40 a. m, what time will they next flash together

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  1. 8 February, 12:55
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    Given that their least common multiple would be 120, they would flash together 2 minutes later, at 10:42
  2. 8 February, 13:12
    0
    They will flash at the same time every 120 minutes. 10:40 + 120 min = 12:40. They will both flash again at 12:40
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