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On a journey across Kolkata, a taxi averages 50 km per hour for 50% of the distance, 40 km per hour for 40% of it and 20 km per hour for the remaining. The average speed (in km/hour) for the whole journey is :
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- 42
- 40
- 35
- 45
Correct Option: B
Total distance = 100 km.
| Total time = | + | + | |||
| 50 | 40 | 20 |
| = 1 + 1 + | = | hours | ||
| 2 | 2 |
| ∴ Average speed = | = 40 kmph | |
| 5 |
