If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work ?

If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work ?
1). 60 days
2). 45 days
3). 40 days
4). 30 days

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