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Raja can do a piece of work in 4 hours. Raja and Praja together can do it in just 2 hours, while Rani and Praja together need 3 hours to finish the same work. Rani alone can complete the work in _____ hours.

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Raja can do a piece of work in 4 hours. Raja and Praja together can do it in just 2 hours, while Rani and Praja together need 3 hours to finish the same work. Rani alone can complete the work in _____ hours.






 
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