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13-10-2022
Mathematics

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Silvia has built a mechanical model solar system with three balls representing planets at the end of rods. Each rod is attached to the center representing the sun. The planets are lined up when she turns on the motor. The innermost planet makes a revolution in 20 seconds, the middle planet makes a revolution in 28 seconds, and the outermost planet makes a revolution in 34 seconds. After how many seconds will the planets be lined up again?

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