alleryStart learning →Pipe A fills a tank in 3 hours and pipe B in 6 hours. How long do both take together?
A2 hours
B1 hour
C4 1/2 hours
D9 hours
Answer & Solution
Correct answer: A. 2 hours
Together they fill 1/3 + 1/6 = 1/2 of the tank each hour, so the tank fills in 2 hours.
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