Bank Math Master২টি পরীক্ষায় এসেছেপ্রশ্ন ১৯A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 4 days. B can do the work alone in-ক12 daysখ8 daysগ14 daysঘ10 daysউত্তর দেখুন