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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?

  • 1
    6.5 hrs
  • 2
    7.2 hrs
  • 3
    2.5 hrs
  • 4
    3 hrs
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Answer : 2. "7.2 hrs"

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