If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it ?

If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it ?
1). 10 days
2). 11 days
3). 9 days
4). 12 days

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