Quantitative Aptitude :: Pipes & Cistern - Discussion
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Choose the correct option.
A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both taps are opened simultaneously, then after how much time will the cistern get filled ?
A5 hours
B4.5 hours
C7.2 hours
D6.5 hours
Answer: Option (Login/Signup)
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