9) When visiting the doctor, she gives you 1 l milligrams of radioactive dye. After 20 minutes, 5.2 milligrams remain in your system. To leave the ofce, you must pass through a radiation detector without sounding the alarm. The detector will sound if there are more than 2 milligrams of dye in your system. How long will your visit to the doctor taken, assuming you were given the dye as soon as you arrived