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If Roberto does a job in 11 hours and with the help of Sarah they can do it together in 2 hours, how long would it take Sarah to do it alone?
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If Roberto does a job in 11 hours and with the help of Sarah they can do it together in 2 hours, how long would it take Sarah to do it alone?

User Mhu
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i think it is seven but im probaly wrong
User ArtBelch
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