Three persons begin to walk around a circular track. They complete their revolution 15-1/6 seconds, seconds, and 18-2/3 seconds respectively. After how many seconds will they be together at the starting point again?

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Three persons begin to walk around a circular track. They complete their revolution 15-1/6 seconds, <img alt='34431.png' src='https://www.fatskills.com/math-simplified/34431.png'/> seconds, and 18-2/3 seconds respectively. After how many seconds will they be together at the starting point again?