A can do a piece of work in 6 days and B can do it in 4 days separately. How many days would it take for both A and B to finish the same work together?

A can do a piece of work in 6 days and B can do it in 4 days separately. How many days would it take for both A and B to finish the same work together?
1). 12/7
2). 12/15
3). 24/10
4). 11/5

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