What is the flow rate in mL/h for infusing 80 mL over half an hour using a burette?

What is the flow rate in mL/h for infusing 80 mL over half an hour using a burette?

• A. 160 mL/h
• B. 150 mL/h
• C. 170 mL/h
• D. 180 mL/h

Answer: (A)

Flow rate is the amount of fluid delivered per unit time. To find mL/h, divide the volume by the time in hours. Here, 80 mL infused in half an hour equals 0.5 hours, so 80 ÷ 0.5 = 160 mL/h. You can also check by converting 30 minutes to hours (0.5 h) or by calculating 80 mL per 30 minutes (80/30 ≈ 2.666... mL/min) and then converting to per hour (2.666... × 60 = 160 mL/h). The other rates would require shorter or longer times than 30 minutes, so they don’t apply to this scenario.

Flow rate is the amount of fluid delivered per unit time. To find mL/h, divide the volume by the time in hours. Here, 80 mL infused in half an hour equals 0.5 hours, so 80 ÷ 0.5 = 160 mL/h. You can also check by converting 30 minutes to hours (0.5 h) or by calculating 80 mL per 30 minutes (80/30 ≈ 2.666... mL/min) and then converting to per hour (2.666... × 60 = 160 mL/h). The other rates would require shorter or longer times than 30 minutes, so they don’t apply to this scenario.