A man can do a piece of work in 8 days and another man can do the same work in 10 days. How long should it take both A and B working together but independently ?

1
6 days
2
\(4 \frac{4}{9}\) days
3
\(4 \frac{1}{5}\) days
4
\(5 \frac{1}{2}\) days

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