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John can do a certain job in 3 hours,sarah can do the same job in 7 hours,Jane can do the same job in 5 hours,how long will the job take the three of them working together?

John can do a certain job in 3 hours,sarah can do the same job in 7 hours,Jane can do the same job in 5 hours,how long will the job take the three of them working together?

Interested in a PLAGIARISM-FREE paper based on these particular instructions?...with 100% confidentiality?

Order Now