Worked example

IV infusion time — practice problem 11

An IV pump is running 500 mL of D5W at 20 mL/hr.

Volume500 mL
Rate20 mL/hr

How long will the infusion take (hours)?

Answer: 25 hr

Step-by-step solution

1. Divide the volume by the rate
500 mL ÷ ( 20 mL ÷ 1 hr )
2. Cancel mL and solve for hours
= 500 ÷ 20 hr
= 25 hr
3. Convert the decimal hours to hours and minutes
25 hr = 25 hr
= 25 hr

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