Final answer:
The correct unit rate for 1/5 quart per 1/20 minute is 4 quarts per minute, since dividing the amount of quarts by the fraction of the minute yields the number of quarts in one whole minute.
Step-by-step explanation:
The question is about converting units and finding the correct unit rate. The original rate given is 1/5 quart per 1/20 minute. To find the unit rate, we must determine how many quarts are dispensed in one minute.
Since the time is less than a minute (1/20), we will divide to find the larger unit rate per each minute.
Here is the correct calculation:
(1/5) quarts ÷ (1/20) minutes = 4 quarts per minute.