alleryStart learning →One pipe fills a tank in 6 hours and another in 12 hours. Both open, it fills in
A4 hours
B3 hours
C3.5 hours
D9 hours
Answer & Solution
Correct answer: A. 4 hours
Together they fill 1/6 + 1/12 = 1/4 of the tank per hour, taking 4 hours.
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