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A bus covers four successive 3 km stretches at speed of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr respectively. Its average speed over this distance is
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- 30 km/hr
- 25 km/hr
- 20 km/hr
- 10 km/hr
Correct Option: C
| Average speed = | |
| Time taken |
| = | ||||||||
| + | + | + | ||||||
| 10 | 20 | 30 | 60 | |||||
= | |||||
| 3 |  |  | |||
| 60 | |||||
| = | = 20 kmph | |
| 3 × 12 |
