Answer:
25 seconds
Step-by-step explanation:
You have a rate of:
[tex]\dfrac{1}{5}gal/s[/tex]
And you want to find how many seconds it would take to fill in 5 gallons of water. Using the rate, we use it as a conversion factor from rate to seconds:
[tex]5gal\times\dfrac{1sec}{\frac{1}{5}gal}=\dfrac{5sec}{\frac{1}{5}}=25sec[/tex]
