প্রশ্ন সংশোধন করুন
প্রশ্ন:
A and B can do a work in 12 days , B and C in 15 days , C and A in 20 days. If A,B and C work together,they will complete the work in :
A and B can do a work in 12 days , B and C in 15 days , C and A in 20 days. If A,B and C work together,they will complete the work in :