P and Q can do a project in 12 and 12 days respectively. In how many days can they complete 50% of the project if they work together?

P and Q can do a project in 12 and 12 days respectively. In how many days can they complete 50% of the project if they work together?
1). 6 days
2). 3 days
3). 18 days
4). 1.5 days

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