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Mathematics, 17.08.2021 03:30 jtingley0502

Robert has built a mechanical model solar system with three balls representing planets at the ends of rods attached to the center representing the sun. The planets are aligned when he
turns on the motor. The innermost planet makes a revolution in 18 seconds, the middle
planet makes a revolution in 30 seconds, and the outermost planet makes a revolution in 42
seconds. After how many seconds will the planets be aligned again?

A. 1260 seconds
B. 630 seconds
C. 315 seconds
D. 945 seconds

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