First we have to calculate the time. Let's divide 600 mL by 110 ml/hr. The result is 5.45 hours. Converting 5.45 hours to minutes we obtain 327 min. Then we divide 600 by 327, the result is 1.83. And then we multiply it by 10 gtt/min. The result is 18.3 rounded is 19 gtts/min.