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MMLU / The rate at which a purification process can remove contaminants from a tank of…

Problem

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question

The rate at which a purification process can remove contaminants from a tank of water is proportional to the amount of contaminant remaining. If 20% of the contaminant can be removed during the first minute of the process and 98% must be removed to make the water safe, approximately how long will the decontamination process take?

choices

  1. 2 min
  2. 5 min
  3. 18 min
  4. 20 min

subject

high_school_mathematics

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