A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work ?

A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work ?
1). 16 days
2). 14 days
3). 10 days
4). 12 days

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