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11)

Salim takes 8 days to finish a piece of work. Manoj takes 12 days to finish the same piece of work. Raj works twice as fast as Salim. How many days will all three of them together take to finish the same piece of work?

12)

A man, a woman and a boy together complete a piece of work in 3 days. If a man alone can do it in 6 days boy alone in 18 days, how long woman take to complete the work?

**[NICL (AO), 2013]**

13)

B and C together can complete a work in 8 days. A and B together can complete the same work in 12 days and A and C together can complete the same work in 16 days. In how many days can A, B and C together complete the same work?

**[Andhra Bank (PO), 2009]**

14)

A, B and C can complete a piece of work in 12, 24 and 36 days respectively. In how many days will they together complete the same work?

15)

A and B together can complete a work in 8 days and B and C together can complete the work in 12 days. All of the three can complete the work in 6 days. In how much time will A and B together complete the work?

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