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To determine the correct infusion rate of cimetidine to be administered over 20 minutes, it's essential to calculate the volume per hour based on the time provided.

Assuming a standard dosage of cimetidine is typically around 300 mg to 600 mg which is diluted in a volume of IV fluid, if we take a common example of 100 ml to be infused over 20 minutes, we would first need to establish how many mL need to be administered in an hour.

Since 20 minutes is one-third of an hour, we can find the required rate by scaling up from the 20-minute volume:

1. Convert 20 minutes into hours: 20 minutes = 1/3 hour.

2. The infusion rate (in mL/hr) can be calculated by multiplying the volume to be infused (e.g. 100 mL) by a factor to determine the hourly rate. Since there are three 20-minute durations in one hour, you would take the total volume and multiply it by 3.

Thus, if 100 mL is to be given in 20 minutes:

- 100 mL x 3 = 300 mL/hr for a full hour.

However, if the question specifically states