If A can be complete the piece of work in 10 days and B can complete the same piece of work in 20 days.In how many days the work can be complete if both are work together?  Pick one:
A) 20/3
B) 3/20
C) 18/20
D) 9/5
E) 19/5
A's one day work=1/10   B's one day work=1/20   The question is If A and B work together, then how many days that will complete?   A+B=1/10+1/20=3/20(one day work)   20/3 days could complete their work.   The answer is option 20/3
<result>A</result>
If A can be complete the piece of work in 10 days and B can complete the same piece of work in 20 days.In how many days the work can be complete if both are work together?