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%

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

a) 2minutes b) 5minutes c) 7minutes d) 18minutes

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