Worked example

IV infusion time - practice problem 13

An IV pump is running 250 mL of D5W at 20 mL/hr.

Volume250 mL
Rate20 mL/hr

How long will the infusion take (hours)?

Answer: 12.5 hr

Step-by-step solution

1. Divide the volume by the rate
250 mL ÷ ( 20 mL ÷ 1 hr )
2. Cancel mL and solve for hours
= 250 ÷ 20 hr
= 12.5 hr
3. Convert the decimal hours to hours and minutes
12.5 hr = 12 hr 30 min
= 12 hr 30 min

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