Worked example

IV infusion time - practice problem 7

An IV pump is running 250 mL of lactated Ringer's at 125 mL/hr.

Volume250 mL
Rate125 mL/hr

How long will the infusion take (hours)?

Answer: 2 hr

Step-by-step solution

1. Divide the volume by the rate
250 mL ÷ ( 125 mL ÷ 1 hr )
2. Cancel mL and solve for hours
= 250 ÷ 125 hr
= 2 hr
3. Convert the decimal hours to hours and minutes
2 hr = 2 hr
= 2 hr

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