A. a nurse practitioner prepares 500. ml of an iv of normal saline solution to be delivered at a rate of 80. ml/h. what is the infusion time, in hours, to deliver 500. ml? b.  a nurse practitioner orders medrol to be given 1.5 mg/kg of body weight. medrol is an anti-inflammatory administered as an intramuscular injection. if a child weighs 72.6 lb and the available stock of medrol is 20. mg/ml, how many milliliters does the nurse administer to the child?