## Two lighthouses can be seen from the top of the hill. The first flashes once every 3 seconds and the other flashes once every 5 se

Question

Two lighthouses can be seen from the top of the hill. The first flashes once every 3 seconds and the other flashes once every 5 seconds. If they flash at the same time, how long will it be before they flash at the same time again?

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Mathematics
5 months
2021-07-08T02:24:59+00:00
2021-07-08T02:24:59+00:00 1 Answers
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## Answers ( )

We know that first flashes once every 3 seconds and the other flashes once every 5 seconds,Therefore we need to take the LCM of those two numbers3- 3,6,9,12,155- 5,10,15Therefore after 15 seconds they both will flash at the same time.