Time, Speed & Distance · Question 22 · Medium
If a car's speed is increased by 10 km/h, it takes 1 hour less to cover 200 km. What is its original speed?
- 45 km/h
- 30 km/h
- 50 km/h
- 40 km/h
Answer and explanation
Answer: D. 40 km/h
Explanation: 200/v − 200/(v + 10) = 1 gives v² + 10v − 2,000 = 0, so v = 40 km/h (the other root is negative). Check: 5 hours vs 4 hours.
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