A can do a piece of work in 15 days and B does the same work in 25 days. In how many days will A and B together complete this work?

1
\(6{{5} \over 16}\)
2
\(9{{3} \over 8}\)
3
\(7{{5} \over 16}\)
4
\(8{{5} \over 16}\)

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