Anil takes 'a' fewer days than Beena to complete a task. They start the task together, but after 'b' days, Anil leaves, leaving Beena to finish the rest of the work on her own. If the ratio of work accomplished by Beena and Anil is 3:1, for how many days did Beena work alone?
1
(3a/4) + b
2
(5a/4) + 2b
3
(5a/4) - b
4
(3a/4) + 2b
5
None of the above