"`A\ a n d\ B` can do a piece of work in 6 days and 4 days   respectively. A started the work;
Channel: Doubtnut
Date: 2020-07-05

"`A\ a n d\ B`
 can do a piece of work in 6 days and 4 days
 
  respectively. A started the work; worked at it for 2 days and then was joined
 
  by `B`
 . Find
 
  the total time taken to complete the work."