nurse preparing to administer 40ml of 0.9% sodoim chloride to infuse over 20 mins. drop factor of the manual iv tubing is 15 gtt/ml. how many gtt/minnurse preparing to administer 40ml of 0.9% sodoim chloride to infuse over 20 mins. drop factor of the manual iv tubing is 15 gtt/ml. how many gtt/min