A particular job can be completed by a team of 10 men in 12 days. The same Job can be completed by a team of 10 women in 6 days. How many days are needed to complete the Job if the two teams work together?

A particular job can be completed by a team of 10 men in 12 days. The same Job can be completed by a team of 10 women in 6 days. How many days are needed to complete the Job if the two teams work together?
1). 4 days
2). 6 days
3). 9 days
4). 18 days

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