P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?
1). 20 days
2). 30 days
3). 40 days
4). 10 days

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