Mathematics, 20.11.2019 09:31 neariah24

Jonathan can type a 20 page document in 40 minutes, susan can type it in 30 minutes, and jack can type it in 24 minutes. working together, how much time will it take them to type the same document?

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Jonathan can type a 20 page document in 40 minutes, susan can type it in 30 minutes, and jack can ty...