"A and B can together finish a work in 30 days.   They worked together for 20 days and then B lef
Channel: Doubtnut
Date: 2020-07-05

"A and B can together finish a work in 30 days.
 
  They worked together for 20 days and then B left. After another 20 days, A
 
  finished the remaining work. In how many days A alone can finish the job ? 
 `40`
 b. `50`
 c. `54`
 d.
 `60`"