Working 5 hours a day, A can complete a work in 8 days and working 6 hours a day, B can complete the same work in 10 days. Working 8 hours a day, they can jointly complete the work in -

• ক 7 days
• খ 3 days ✅ সঠিক উত্তর
• গ 6 days
• ঘ 4 days