alleryStart learning →One pipe fills 1/6 of a tank per hour, another fills 1/3. Together, how many hours to fill it?
A6
B3
C1
D2
Answer & Solution
Correct answer: D. 2
Together they fill 1/6 + 1/3 = 1/2 of the tank per hour, so a full tank takes 2 hours.
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