A patient with acute coronary syndrome is ordered Heparin sodium 1100 units/hour by continuous intravenous infusion. The pharmacy delivers the following solution: Heparin 25,000 units mixed in 500 ml of DSW. What is the rate (in ml/hr) that the nurse will set the infusion pump to deliver the ordered dose? Calculate and fill in the blank (Round the final answer to the nearest whole number).