If 9 men and 6 women working together can do six times as much work per hour as 1 man and 2 women working together, then the ratio of the work done by 1 man to that of 1 woman in a given time is:

1
1 : 3
2
2 : 1
3
2 : 3
4
1 : 4
5
None of the above

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