A can do a work in 15 days and B in 30 days. If they work on it together, then in how many days will they be able to do 50% of the work?

A can do a work in 15 days and B in 30 days. If they work on it together, then in how many days will they be able to do 50% of the work?
1). 5
2). 6
3). 4
4). 3

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