A can complete a work in 42 days, B is 20% more efficient than A. Find the time taken by A and B together to complete the work.
1
17(1/11) days
2
19(1/11) days
3
21(1/13) days
4
18(3/13) days
5
None of these
A can complete a work in 42 days, B is 20% more efficient than A. Find the time taken by A and B together to complete the work.