A person rides bicycle on four different ways to reach the destination. Determine the average speed during this whole journey.
| Way | Speed (km/hr) | Distance (km) |
| A | 5 | 20 |
| B | 3 | 15 |
| C | 2 | 10 |
| D | 4 | 24 |
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 3.45
Given that
| Way | Speed (km/hr) | Distance (km) |
| A | 5 | 20 |
| B | 3 | 15 |
| C | 2 | 10 |
| D | 4 | 24 |
The average speed = Total distance covered/Total time taken
= (20 + 15 + 10 + 24)/[(20/5) + (15/3) + (10/2) + (24/4)]
= 69/(4 + 5 + 5 + 6) = 69/20 = 3.45 km/h