Susan has been sick with a cold and has a sore throat. Her doctor recommended that she rest, keep hydrated, and sip warm liquids, like tea, to soothe her sore throat. Her little brother, Jay, who is always trying to be helpful made her some tea, some real hot tea! If the temperature of the tea Jay made was 185, and after it was left standing for 5 minutes in a room where the surrounding temperature is 77, the final temperature of the tea measured 170, how long would it take for the tea to reach a temperature of 150?