Two boats A and B start towards each other from two places, 135 km apart. Speed of the boats A and B in still water are 12 km/h and 15 km/h respectively. If A proceeds down and B up the stream, they will meet after:

• ক 6 hours
• খ 5 hours ✅ সঠিক উত্তর
• গ 3 hours
• ঘ 4 hours