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Maths Mcqs

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. 4.5 hrs
B. 5 hrs
C. 6.5 hrs
D. 7.2 hrsCorrect Answer
Correct Option: D. 7.2 hrs

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