A nurse is preparing to administer nitroglycerin by continuous IV infusion at 15 mcg/min to treat a client's angina. Available is nitroglycerin 50 mg in dextrose 5% in water 250 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)