20 Infusion-Time Practice Questions
Practise rearranging the volume-rate-time relationship to calculate a fictional duration. Decimal hours are converted to minutes in selected worked answers.
Use fictional or tutor-provided values only. These pages explain arithmetic and do not select, recommend, verify or administer treatment. Do not enter patient information or use DosePractice in a clinical workflow.
Formula
time in hours = volume in mL ÷ rate in mL/hour
How to use these questions
Work each question on paper or in a separate note before opening the answer. Keep the units beside every number and write the formula before substituting values.
The questions are deliberately fictional and test arithmetic only. Real medicines, patient factors, limits, local policy and equipment checks are outside DosePractice’s purpose.
A repeatable checking method
- Identify what the question asks for and write its unit.
- Convert time or measurement units before calculating.
- Substitute values into the displayed formula.
- Estimate whether the answer should be larger or smaller than the starting values.
- Reveal the worked answer and compare every step, not only the final number.
20 practice questions
Try each fictional arithmetic question before opening its worked answer. Each item has a stable question ID and reporting link.
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A fictional 500 mL volume runs at 125 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
500 ÷ 125 = 4 hours
Mathematical result for this practice example: 4 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 750 mL volume runs at 100 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
750 ÷ 100 = 7.5 hours
Mathematical result for this practice example: 7.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 300 mL volume runs at 120 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
300 ÷ 120 = 2.5 hours
Mathematical result for this practice example: 2.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 1,000 mL volume runs at 125 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
1,000 ÷ 125 = 8 hours
Mathematical result for this practice example: 8 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 250 mL volume runs at 100 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
250 ÷ 100 = 2.5 hours
Mathematical result for this practice example: 2.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 120 mL volume runs at 80 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
120 ÷ 80 = 1.5 hours
Mathematical result for this practice example: 1.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 600 mL volume runs at 120 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
600 ÷ 120 = 5 hours
Mathematical result for this practice example: 5 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 90 mL volume runs at 120 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
90 ÷ 120 = 0.75 hours, which is 45 minutes
Mathematical result for this practice example: 0.75 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 50 mL volume runs at 200 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
50 ÷ 200 = 0.25 hours, which is 15 minutes
Mathematical result for this practice example: 0.25 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 480 mL volume runs at 120 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
480 ÷ 120 = 4 hours
Mathematical result for this practice example: 4 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 1,000 mL volume runs at 80 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
1,000 ÷ 80 = 12.5 hours
Mathematical result for this practice example: 12.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 225 mL volume runs at 75 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
225 ÷ 75 = 3 hours
Mathematical result for this practice example: 3 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 360 mL volume runs at 90 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
360 ÷ 90 = 4 hours
Mathematical result for this practice example: 4 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 200 mL volume runs at 125 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
200 ÷ 125 = 1.6 hours, which is 1 hour 36 minutes
Mathematical result for this practice example: 1.60 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 420 mL volume runs at 120 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
420 ÷ 120 = 3.5 hours
Mathematical result for this practice example: 3.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 150 mL volume runs at 60 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
150 ÷ 60 = 2.5 hours
Mathematical result for this practice example: 2.50 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 800 mL volume runs at 100 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
800 ÷ 100 = 8 hours
Mathematical result for this practice example: 8 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 75 mL volume runs at 100 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
75 ÷ 100 = 0.75 hours, which is 45 minutes
Mathematical result for this practice example: 0.75 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 240 mL volume runs at 80 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
240 ÷ 80 = 3 hours
Mathematical result for this practice example: 3 hours
Check the operation order, unit conversion and final unit before moving on.
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A fictional 900 mL volume runs at 120 mL/hour. How long will it take?
Show worked answer
Formula or method: time in hours = volume in mL ÷ rate in mL/hour
Substitution and working:
900 ÷ 120 = 7.5 hours
Mathematical result for this practice example: 7.50 hours
Check the operation order, unit conversion and final unit before moving on.
Continue practising
Related learning
Content status and sources
This page is an original DosePractice public-beta learning resource. It remains subject to continuing educational, regulatory and editorial review; corrections are published when issues are identified.
- Nursing and Midwifery Council programme standards require health numeracy assessment related to medicine calculation, but DosePractice is not an NMC assessment or approved programme.
- Formula presentation should be independently reviewed against current tutor-approved or institutional teaching material before search indexing is enabled.
Review references
- NMC standards for pre-registration nursing programmes
- University of Southampton drug-calculation learning guide
- York St John University nursing formula sheet
Read the DosePractice content-review approach or report a problem.