A and B together can do a piece of work in 20 days and A alone can do it in 30 days. B alone can do the work in how many days?

A and B together can do a piece of work in 20 days and A alone can do it in 30 days. B alone can do the work in how many days?
1). 45
2). 60
3). 75
4). 90

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