Digital ACT Math Practice Question #1439
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Time = (A * B) / (A + B) = (6 * 9) / (6 + 9) = 54 / 15 = 3.6 hours.
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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