A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled? | MCQ Hive

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Q A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

A A. 4.5 hrs
B B. 5 hrs
C C. 6.5 hrs
D D. 7.2 hrs

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