A patient needs 250 mL over 30 minutes. What is the required mL/h?

A patient needs 250 mL over 30 minutes. What is the required mL/h?

• A. 250 mL/h
• B. 750 mL/h
• C. 600 mL/h
• D. 500 mL/h

Answer: (D)

The rate is found by dividing volume by time. Here, 250 mL over 30 minutes equals 0.5 hours. So the rate is 250 mL ÷ 0.5 h = 500 mL per hour. This means delivering 500 mL in 60 minutes, which would deliver 250 mL in 30 minutes. The other options don’t match this time frame: 250 mL/h would take a full hour to deliver 250 mL, 750 mL/h would deliver faster than required, and 600 mL/h would deliver 250 mL in about 25 minutes.

The rate is found by dividing volume by time. Here, 250 mL over 30 minutes equals 0.5 hours. So the rate is 250 mL ÷ 0.5 h = 500 mL per hour. This means delivering 500 mL in 60 minutes, which would deliver 250 mL in 30 minutes. The other options don’t match this time frame: 250 mL/h would take a full hour to deliver 250 mL, 750 mL/h would deliver faster than required, and 600 mL/h would deliver 250 mL in about 25 minutes.