Worked example

IV infusion time — practice problem 2

An IV pump is running 250 mL of 0.9% normal saline at 80 mL/hr.

Volume250 mL
Rate80 mL/hr

How long will the infusion take (hours)?

Answer: 3.13 hr

Step-by-step solution

1. Divide the volume by the rate
250 mL ÷ ( 80 mL ÷ 1 hr )
2. Cancel mL and solve for hours
= 250 ÷ 80 hr
= 3.13 hr
3. Convert the decimal hours to hours and minutes
3.13 hr = 3 hr 8 min
= 3 hr 8 min

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