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Question 48

A filter processes 180 litres in 12 minutes. Which statement correctly identifies the rate and avoids an inverted unit label?

  1. The rate is 15 litres per minute.Correct answer
  2. The rate is 15 minutes per litre.
  3. The rate is 168 litres per minute.
  4. The rate is 2160 minutes per litre.

Explanation

Dividing 180 litres by 12 minutes gives 15 litres per minute. The quantity 15 minutes per litre uses the same number with reversed units, but the actual reciprocal would be 12 divided by 180 instead.

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Question 48: A filter processes 180 litres in 12 minutes. Which… · Ratios and Proportions · Questena