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9 December, 08:38

One street light flashed every 4 seconds Another street light flashes every 6 seconds If they both just flashed as the same movement how many seconds will it take before thwart flash at the same time again

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  1. 9 December, 10:38
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    Time for light A's Flash = 4 seconds

    Time for light B's Flash = 6 seconds

    Duration between the lights = 6-4=2

    Duration to flash again = LCM of 6, 4

    2/6,4

    2/3,2

    3/3,1

    /1,1

    2x2 x 3

    4 x 3

    = 12 seconds
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