প্রশ্ন সংশোধন করুন
প্রশ্ন:
A and B can do a piece of work in 12 days while A alone can do it in 20 days. How long will B alone take to finish the work?
A and B can do a piece of work in 12 days while A alone can do it in 20 days. How long will B alone take to finish the work?