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Jane and Bill are cleaning up a park. If she had to clean up the park herself, it would take Jane 6 hours to complete

Jane and Bill are cleaning up a park. If she had to clean up the park herself, it would take Jane 6 hours to complete the job. If Bill alone were to clean the park, it would take him 3 hours. Working together, how long will it take Jane and Bill to clean the park?

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