The concentration of an anti-viral drug in a patient’s blood following intravenous drug administration was 6.0 x 10–6 M. After 90 minutes, the concentration of the drug had decreased in a first-order fashion to 1.7 x 10–6 M. If the drug must be re-administered when the concentration in the blood reaches 2.0 x 10–7 M, how long (approximately) after the initial injection will the patient next require the drug?
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