[Enquiry Officer, 2018]

13. If A and B, working together can finish a piece of work in 5 days, B and C in 3 days, C and A in 6 days. How much time will they take to complete the work, if A, B and C work together?

1. \(7 {4\over 5} days\)

2. \(6 {4\over 5} days\)

3. \(7 {2\over 3} days\)

4. \(2 {6\over 7} days\)

Correct Answer :

\(2 {6\over 7} days\)