A can do a piece of work in 70 days and B is 40% more efficient than A. The number of days taken by B to do the same work is

A can do a piece of work in 70 days and B is 40% more efficient than A. The number of days taken by B to do the same work is
1). 40 days
2). 60 days
3). 50 days
4). 45 days

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