ACT Math Practice Question #1439 (Medium (31)) | Test Citadel
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ACT Math Difficulty: Medium (31)

Digital ACT Math Practice Question #1439

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Working alone at a constant rate, pump A can empty a water reservoir in 6 hours, while pump B can empty the same reservoir in 9 hours. If both pumps operate simultaneously, how many hours will it take to empty the reservoir?
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Socratic AI Engine Step-by-Step Derivation
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Time = (A * B) / (A + B) = (6 * 9) / (6 + 9) = 54 / 15 = 3.6 hours.

Masterclass Solution & Distractor Trap Analysis

Combined rate = 1/6 + 1/9 = 3/18 + 2/18 = 5/18 reservoir per hour. Time = 18 / 5 = 3.6 hours....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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