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13 August, 10:39

In a video game, a character needs to shine a light through two spinning wheels that have holes in them. The first wheel makes a complete rotation in 7 seconds. The second wheel makes a complete rotation in 9 seconds. The hole are lined up at 0 seconds. How many seconds will pass before they are lined up again?

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  1. 13 August, 11:58
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    63 seconds

    they would have to rotate until they became equal so one would rotate 7 times and one would rotate 9 times.
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