"`A\ a n d\ B` can polish the floors of a building in 10 days. `A` alone can do `1/4`  of work in
Channel: Doubtnut
Date: 2020-07-12

"`A\ a n d\ B`
 can polish the floors of a building in 10 days. `A`
 alone can do `1/4`
  of work in 12 days. In how many days can B alone
  polish the floor?"