Akash can do a piece of work in 30 days. He works at it for 6 days and then Rakib finishes it in 18 days. In what time can Akash and Rakib together finish the work?

• ক 12 days
• খ 90/7 days ✅ সঠিক উত্তর
• গ 9 days
• ঘ 90/11 days