A burette pump must deliver 600 mL of fluid over 3 hours. What is the rate in mL/h?

A burette pump must deliver 600 mL of fluid over 3 hours. What is the rate in mL/h?

• A. 180 mL/h
• B. 190 mL/h
• C. 200 mL/h
• D. 210 mL/h

Answer: (C)

Rate is the amount of fluid delivered per unit of time. For a burette pump delivering 600 mL in 3 hours, divide the volume by the time: 600 ÷ 3 = 200. So the rate is 200 mL per hour (200 mL/h). If you check the other values, 180 mL/h would take about 3.33 hours to deliver 600 mL, 190 mL/h about 3.16 hours, and 210 mL/h about 2.86 hours. Keeping the units in mL per hour makes the correct rate clear.

Rate is the amount of fluid delivered per unit of time. For a burette pump delivering 600 mL in 3 hours, divide the volume by the time: 600 ÷ 3 = 200. So the rate is 200 mL per hour (200 mL/h).

If you check the other values, 180 mL/h would take about 3.33 hours to deliver 600 mL, 190 mL/h about 3.16 hours, and 210 mL/h about 2.86 hours. Keeping the units in mL per hour makes the correct rate clear.