A and B can do a piece of work in 9 days and 15 days, respectively. If they work together, then the work will be completed in: 

1
\(2 \frac{1}{8}\) days
2
\(3 \frac{3}{8}\) days
3
\(5 \frac{5}{8}\) days
4
\(4 \frac{5}{8}\) days

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