P and Q can do a project in 60 and 30 days respectively. In how many days can they complete 90% of the project if they work together?

P and Q can do a project in 60 and 30 days respectively. In how many days can they complete 90% of the project if they work together?
1). 9 days
2). 27 days
3). 36 days
4). 18 days

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