Answer:
a. 67.5
Step-by-step explanation:
∵ 1 qt = 0.25 gallon
Also, 1 hour = 60 minutes,
⇒ 1 minute = \(\frac{1}{60}\) hour,
\(\implies 4.5\text{ qt per minute}\)
\(=\frac{4.5\times 0.25}{\frac{1}{60}}\text{ gal per hour}\)
\(=4.5\times 0.25\times 60\text{ gal per hour}\)
\(=67.5\text{ gal per hour}\)
Hence, option 'a' is correct.
