A and B can together do a piece of work in 10 days. If A works with twice of his efficiency and B works with 1/3rd of his efficiency, then the work gets completed in 6 days. In how many days can A and B do the work alone respectively?
1
25/2, 50
2
20/3, 20
3
30, 20/3
4
50/3, 25
5
10/3, 24