Hot drinks are safe to drink at 155F but the optimal temperature is 135F. Suppose you set some water to heat and forgot about it until it was at boiling temperature (212F), and you went ahead and poured yourself a cup of tea. If your kitchen is a comfortable 70F and 5 minutes later, the water temperature in the cup is 180F how long does it take for your tea to cool to a temperature that is safe to drink? How long until the temperature is optimal