What is the flow rate in mL/h when a burette pump delivers 120 mL in 50 minutes?

What is the flow rate in mL/h when a burette pump delivers 120 mL in 50 minutes?

• A. 120 mL/h
• B. 144 mL/h
• C. 180 mL/h
• D. 130 mL/h

Answer: (B)

Flow rate is the amount of fluid delivered per unit time. Here, 120 mL is delivered in 50 minutes. Convert the time to hours: 50 minutes = 50/60 hours = 5/6 hours. Then rate = volume ÷ time = 120 mL ÷ (5/6 h) = 120 × (6/5) = 144 mL/h. So the flow rate is 144 mL per hour. Quick checks: 120 mL/h would mean delivery in one hour, which isn’t the case; 180 mL/h would imply about 40 minutes to deliver 120 mL; 130 mL/h would require around 55.4 minutes.

Flow rate is the amount of fluid delivered per unit time. Here, 120 mL is delivered in 50 minutes. Convert the time to hours: 50 minutes = 50/60 hours = 5/6 hours. Then rate = volume ÷ time = 120 mL ÷ (5/6 h) = 120 × (6/5) = 144 mL/h. So the flow rate is 144 mL per hour.

Quick checks: 120 mL/h would mean delivery in one hour, which isn’t the case; 180 mL/h would imply about 40 minutes to deliver 120 mL; 130 mL/h would require around 55.4 minutes.