A is twice as efficient as B. A alone takes 6 days to complete a piece of work. In how many days can A and B complete a piece of work if they work together?
1
2 days
2
3 days
3
4 days
4
5 days
A is twice as efficient as B. A alone takes 6 days to complete a piece of work. In how many days can A and B complete a piece of work if they work together?