A nurse is caring for a school-age child who has a new prescription for an IV infusion of 250 mL lactated Ringers to run over 6 hr. The nurse should ensure the IV pump is set 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.)

Identify the given information: Volume of lactated Ringer's solution: 250 mL Infusion time: 6 hours Calculate the infusion rate in mL/hr: Infusion rate = Volume / Time Substitute the values: Infusion rate = 250 mL / 6 hr Calculate the result: Infusion rate ≈ 41.67 mL/hr Round the answer to the nearest whole number: Infusion rate ≈ 42 mL/hr