Two trains, one from Dhaka to Chittagong and one from Chittagong to Dhaka, started simultaneously. After they meet, the trains reach their destinations after 4 hours and 9 hours respectively. What is the ratio of their speed?

• ক 3 : 2 ✅ সঠিক উত্তর
• খ 2 : 4
• গ 2 : 3
• ঘ 4 : 2