A nurse is preparing to administer ampicillin/sulbactam 1.5 g via intermittent IV bolus. Available is ampicillin/sulbactam 1.5 g in 0.9% sodium chloride 100 mL to infuse over 30 min. The nurse should set the IV infusion 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.)