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A lorry covers a distance of 100 km in 2 hours 30 minutes. A car runs with a speed of 55 km/hour. Determine the ratio of their speeds.

Correct answer: A. 8:11

  • A. 8:11
  • B. 20:11
  • C. 4:11
  • D. None of These

Explanation

The lorry's time is 2 hours 30 minutes = 2.5 hours, so its speed is 100 km / 2.5 h = 40 km/h. The speed ratio of lorry to car is 40 km/h : 55 km/h = 40:55 = 8:11. The common error is using 2 hours instead of 2.5 hours, which gives the wrong lorry speed.

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About Time, Speed and Distance

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