A truck travels 150 km from A to B at 75 km/hr. and returns from B to A along the same route at 50 km/hr. The average speed, in kilometers per hour, for the round trip is:

• ক 60 km/hr ✅ সঠিক উত্তর
• খ 65 km/hr
• গ 55 km/hr
• ঘ 50 km/hr