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Robert has built a mechanical model solar system with 3 balls representing the sun. The planets are aligned when he turns on the motor.The innermost planet makes a revolution in 12 seconds, the middle planet makes a revolution in 20 seconds, and the outermost planet makes a revolution in 28 seconds. AFTER how many seconds will the planets be aligned again?

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7 minutes or 420 seconds

Posted on Feb 03, 2010

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