SAT Ratios, rates, proportional relationships, and units Practice Question 7 (Easy)

Question bank / Ratios, rates, proportional relationships, and units

Math · Problem-Solving and Data AnalysisEasy

A swimming pool is being filled with water at a constant rate of $15$ gallons per minute. How many hours will it take to add $8{,}100$ gallons of water to the pool?

$5.4$

$9$

$54$

$540$

Show answer and explanation

Answer: B

At $15$ gallons per minute, adding $8{,}100$ gallons takes $\frac{8100}{15} = 540$ minutes. Since there are $60$ minutes in an hour, this is $\frac{540}{60} = 9$ hours.

Choice D is the time in minutes; the question asks for hours.

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