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20 July, 23:24

A beacon flashes a light regularly 5 times a minute. A neighboring beacon flashes a light regularly 4 times a minute.

If they shine their lights at the same time, after how many, begin emphasis, seconds, end emphasis, will they flash at the same time again?

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  1. 21 July, 00:16
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    They will flash together every 20 seconds.
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