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Mathematics, 12.04.2020 21:10 dontcareanyonemo

Jack and Serena can write a lab report together in $6$ hours. If all people work at the same rate, how many hours would it take to write a lab report if Kay joins Jack and Serena?

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Jack and Serena can write a lab report together in $6$ hours. If all people work at the same rate, h...

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