If a light house flashes every 6 secs and another flashes every 8 secs and they've just flashed?

Question

if a lighthouse flashes every 6 seconds and another flashes every 8 seconds and they've just flashed together when will they flash together again?

Answer

Get a ruler in your hands. Draw a line six inches long and another line eight inches long. Continue until the ends coincide. Measure the total inches and that is your answer.

If a light house flashes every 6 secs and another flashes every 8 secs and they've just flashed?

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