Final answer:
To determine how many hours the IV will run, divide the total volume of IV fluid by the flow rate. For an order of 250 mL at 60 mL/hr, it will run for about 4.17 hours.
Step-by-step explanation:
The question involves calculating the duration for which an intravenous (IV) fluid will be administered based on the ordered volume and the prescribed flow rate. To find out how many hours the IV will run, you divide the total ordered volume of the IV fluid by the flow rate per hour.
Using the given numbers, you have an order for 250 mL of 0.45% NS IV to be administered at 60 mL/hr. You simply divide 250 mL by 60 mL/hr to find the duration in hours:
Duration = Total Volume / Flow Rate
Duration = 250 mL / 60 mL/hr
Duration ≈ 4.17 hours
Therefore, the IV will run for approximately 4.17 hours.