4. 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?
- 5 hrs.
- 5 hrs.
- 5 hrs.
- 2 hrs.
4. 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?
Dear sir. I am p handicapped help me sir please. HS passed
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