Quantitative Aptitude Time and Work Work Efficiency

A can do a certain work in 15 days, while B can do the same work in 21 days. If they work together, then in how many days will the same work be completed?

1
\(7\frac{3}{4}\)
2
\(9\frac{3}{4}\)
3
\(6\frac{3}{4}\)
4
\(8\frac{3}{4}\)

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