A man completes a certain journey by a car. If he covered 30% of the distance at the speed of 20kmph. 60% of the distance at 40km/h and the remaining of the distance at 10 kmph, his average speed is:

• ক 25 km/h ✅ সঠিক উত্তর
• খ 30 km/h
• গ 33 km/h
• ঘ 28 km/h