A can do \(\frac{1}{3}\) rd of work in 5 days and B can do the do \(\frac{2}{5}\)th of this work in 10 days. Both A and B, together can do the work in?
\({ \text{ 7}}\frac{3}{8}{ \text{ days}}\)
\({ \text{8}}\frac{4}{5}{ \text{ days}}\)
\({ \text{9}}\frac{3}{8}{ \text{ days}}\)
10 days
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2
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3
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4
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6
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8
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