A nurse is preparing to administer lactated Ringer's 500 mL IV to infuse over 4 hr. 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.)

To calculate the infusion rate for lactated Ringer's solution, the nurse should divide the total volume of fluid by the total time of infusion. In this case, the nurse should divide 500 mL by 4 hr, which equals 125 mL/hr. Therefore, the nurse should set the IV pump to deliver 125 mL/hr of lactated Ringer's solution.