"A and B can together finish a work in 30 days. They worked together for 20
Channel: Doubtnut
Date: 05/04/2020

"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`"