A pipe can empty \(\rm\left(\frac{5}{6}\right)^{th}\) part of a cistern in 20 minutes. The part of cistern which will be empty in 9 minutes is:

1

\(\frac{3}{5}\)

2

\(\frac{3}{8}\)

3

\(\frac{4}{5}\)

4

\(\frac{5}{9}\)

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