A and B together can complete a work in 15 days. A is 50% more efficient worker than B. How long will A take to complete the work alone ?

A and B together can complete a work in 15 days. A is 50% more efficient worker than B. How long will A take to complete the work alone ?
1). 20 days
2). 21 days
3). 21.4 days
4). 22.5 days

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