A client is receiving heparin IV at a rate of 1,800 units/hour. The IV solution is labeled, "Heparin Sodium 20,000 Units in 5% Dextrose Injection 500 mL." After receiving the PTT result, the healthcare provider prescribes an increase of 5 mL/hour in the IV rate. The nurse should set the infusion pump to deliver how many mL/hour?