A completes a work in 3 days and B complete the same work in 6 days. If both of them work together, then the number of days required to complete the work will be?  Options:
A) 2 days
B) 11 days
C) 21 days
D) 22 days
E) 24 days
If A can complete a work in x days and B can complete the same work in y days, then, both   of them together can complete the work in x y/ x+ y days   Therefore, here, the required number of days = 3 Ã— 6/ 9 = 2 days.   Option '2 days'
<result>A</result>
A completes a work in 3 days and B complete the same work in 6 days. If both of them work together, then the number of days required to complete the work will be?