প্রশ্ন সংশোধন করুন
প্রশ্ন:
A can do a piece of work in 15 days and B can do it in 10 days. Working together how long will they take to finish the work?
A can do a piece of work in 15 days and B can do it in 10 days. Working together how long will they take to finish the work?