A can do a work in 9 days, if B is 50 % more efficient than A, then in how many days can B do the same work ?

A can do a work in 9 days, if B is 50 % more efficient than A, then in how many days can B do the same work ?
1). 13.5 days
2). 4.5 days
3). 6 days
4). 3 days

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