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11 April, 22:36

Two lighthouses can be seen from the top of a hill. The frist flashes once every 6 seconds and the otherflashes once every 15 seconds.

If they flash simultaneously, how long is it until they flash again at the same time?

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  1. 11 April, 22:38
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    30 seconds

    Step-by-step explanation:

    the second lighthouse flashes every 15 seconds. for the first 15, the other house will not flash because 15/6 is not a whole number. in the next 15 seconds, which is 30 seconds in all, the other will flash because 30/6 is a whole number.
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