Pipe A fills a tank in 6 hours and pipe B fills it in 3 hours. Working together, how many hours do they need?
Answer and explanation
Correct answer: C. 2 h
- Step 1: In one hour they fill 1/6 + 1/3 = 1/2 of the tank.
- Step 2: So the time is the inverse: 2 hours.
Answer
2 h.
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