U, V and W together can complete a work in 15 days. U alone can complete the work in 60 days. In how many days V and W together can complete the same work?

U, V and W together can complete a work in 15 days. U alone can complete the work in 60 days. In how many days V and W together can complete the same work?
1). 10
2). 20
3). 14
4). 12

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