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A man completed a certain journey by a car. If he covered 30% of the distance at the speed of 20km/hr, 60% of the distance at 40km/hr and the remaining distance at 10km/hr; his average speed for the whole journey was
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- 25 km/hr
- 28 km/hr
- 30 km/hr
- 33 km/hr
Correct Option: A
Let the total distance be 100 km.
| Average speed = | |
| Time taken |
| = | |||||
| + | + 1 | ||||
| 2 | 2 | ||||
| = | |||||
| 2 | |||||
| = | = 25 kmph | |
| 8 |
