A burette pump is set to deliver 60 mL over 15 minutes. What is the flow rate in mL/h?

A burette pump is set to deliver 60 mL over 15 minutes. What is the flow rate in mL/h?

• A. 40 mL/h
• B. 240 mL/h
• C. 60 mL/h
• D. 180 mL/h

Answer: (B)

Flow rate is the amount of volume delivered per unit time. Here, 60 mL are delivered in 15 minutes. Convert to hours: 15 minutes is 0.25 hours. So the rate is 60 mL divided by 0.25 h, which equals 240 mL/h. You can also see it as 60 mL/15 min = 4 mL/min, and 4 mL/min × 60 min/h = 240 mL/h. The flow rate is 240 mL per hour.

Flow rate is the amount of volume delivered per unit time. Here, 60 mL are delivered in 15 minutes. Convert to hours: 15 minutes is 0.25 hours. So the rate is 60 mL divided by 0.25 h, which equals 240 mL/h. You can also see it as 60 mL/15 min = 4 mL/min, and 4 mL/min × 60 min/h = 240 mL/h. The flow rate is 240 mL per hour.