How many extra kilometres are covered in 2 hours at 50 km/h instead of 40 km/h?

Question: How many extra kilometres are covered in 2 hours at 50 km/h instead of 40 km/h?

  1. 20 km
  2. 21 km
  3. 19 km
  4. 22 km

Correct Answer: A — 20 km

Explanation: Extra distance = difference in speed × the common travel time.
Using the values in this question gives 20 km as the correct answer.

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