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Mathematics, 25.05.2021 16:50 adahlove

Karl can clean a room in 3 hours. If his little sister Kyra helps, they can clean it in 2.4 hours. How long would it take Kyra to do the job alone? plz help

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Karl can clean a room in 3 hours. If his little sister Kyra helps, they can clean it in 2.4 hours. H...
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