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23 February, 19:22

One lighthouse flashes every 10 seconds, a second lighthouse flashes every 8 seconds. if they flash at the same time, how long will it take to flash at the same time again? a

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  1. 23 February, 20:37
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    For this, we need to find the lowest common multiple of 10 and 8

    multiples of 10 : 10,20,30,40,50

    multiples of 8 : 8,16,24,32,40

    so the LCM of 10 and 8 is 40

    therefore, they will both flash at the same time again in 40 seconds.
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