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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Madelyn 5 months 2021-07-08T02:24:59+00:00 1 Answers 0 views 0

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    2021-07-08T02:26:37+00:00

    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 numbers

    3- 3,6,9,12,15

    5- 5,10,15

    Therefore after 15 seconds they both will flash at the same time.

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9:3-3+1x3-4:2 = ? ( )