Amir and Hannan working together can finish a work in 3 hours. If they work alone, Hannan takes 3 times as long as Amir. How long does Hannan take to finish the job alone?

• ক 14
• খ 12 ✅ সঠিক উত্তর
• গ 16
• ঘ 6
• 5 none