Question
Three lighthouses flash their lights every 20 seconds, 25 seconds and 45 seconds respectively. If they flash together at 4:26 a.m., at what time would the three lighthouses flash their lights together again?
4 m

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Three lighthouses flash their lights every 20 seconds, 25 seconds and 45 seconds respectively. If they flash together at 4:26 a.m., at what time would the three lighthouses flash their lights together again?