A man rides his bicycle for 10 kilometres at a speed of 12 kilometres per hour, then for another 12 kilometres at a speed of 10
kilometres per hour. What is his average speed for the entire trip approximately?
This questions was previously asked in
SSC CHSL 1st June 2022 Shift-1
11.8 km/h
Incorrect Answer11.4 km/h
Incorrect AnswerExplanation:
- To determine the average speed, we need the total distance and the total time.
- Total distance covered: \(10 + 12 = 22\) kilometers.
- Time taken for the first part: \( \frac{10}{12} \approx 0.833\) hours.
- Time taken for the second part: \( \frac{12}{10} = 1.2\) hours.
- Total time taken: \(0.833 + 1.2 = 2.033\) hours.
- Average speed is total distance divided by total time:
\(\frac{22 \text{ km}}{2.033 \text{ hours}} \approx 10.82 \text{ km/h}\).
Correct Answer: Option 1- 10.8 km/h.
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