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How many extra kilometres are covered in 6 hours at 90 km/h instead of 80 km/h?

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Question: How many extra kilometres are covered in 6 hours at 90 km/h instead of 80 km/h?

  1. 61 km
  2. 59 km
  3. 62 km
  4. 60 km

Correct Answer: D — 60 km

Explanation: Extra distance = difference in speed × the common travel time.
Using the values in this question gives 60 km as the correct answer.

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