Multiple choice

A man is moving at a constant speed of 10 km/hr. After each kilometer he stops for 4 minutes. In how much time he will cover a distance of 20 km?

  1. $196 minutes$
  2. $200 minutes$
  3. $2 hours$
  4. $180 minutes$
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A Correct answer
Explanation

Moving time = 20 km ÷ 10 km/hr = 2 hours = 120 minutes. The man stops after each kilometer EXCEPT after the 20th (final) kilometer. So he stops 19 times, taking 19 × 4 = 76 minutes. Total time = 120 + 76 = 196 minutes.

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