A 2.5 GPM faucet will use how many gallons in eight minutes?

To determine how many gallons a 2.5 GPM (gallons per minute) faucet will use in eight minutes, you can multiply the flow rate by the time in minutes.

The calculation is as follows:

[ \text{Gallons used} = \text{Flow rate (GPM)} \times \text{Time (minutes)} ]

By substituting in the values:

[ \text{Gallons used} = 2.5 , \text{GPM} \times 8 , \text{minutes} = 20 , \text{gallons} ]

Thus, a 2.5 GPM faucet will use 20 gallons in eight minutes. This answer aligns with option B, confirming it as the correct choice based on the straightforward multiplication of the flow rate and the duration of usage. Understanding this relationship between flow rate and time is fundamental in calculations related to water usage in plumbing and building analysis.