A completes a work in 20 days. B complete the same work in 30 days. A starts working alone and after 5 days B joins him. How many days will they now take together to complete the remaining work.

A completes a work in 20 days. B complete the same work in 30 days. A starts working alone and after 5 days B joins him. How many days will they now take together to complete the remaining work.

$8 \frac{1}{2}$ days
6 days
7 days
9 days

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