315 gallons per minute is approximately how many cubic feet per second?

• A. 0.340 ft^3/s
• B. 0.702 ft^3/s
• C. 1.200 ft^3/s
• D. 2.500 ft^3/s

Answer: (B)

Converting flow rates between units is about applying the right conversion factors. Start with the fact that 1 gallon equals 0.133681 cubic feet and 1 minute equals 60 seconds. So 315 gallons per minute becomes 315 × 0.133681 = 42.109515 cubic feet per minute. Dividing by 60 seconds per minute gives 42.109515 / 60 ≈ 0.702 cubic feet per second.

Alternatively, 1 gpm equals 0.133681/60 ≈ 0.002228 ft^3/s, and multiplying by 315 yields about 0.702 ft^3/s. This matches the given answer.