A cistern is normally filled by a tap in 5 hours, but suddenly a leak develops and it empties the full cistern in 30 hours with the leak, the cistern is filled in

A cistern is normally filled by a tap in 5 hours, but suddenly a leak develops and it empties the full cistern in 30 hours with the leak, the cistern is filled in
1). 8 hours
2). 6 hours
3). 10 hours
4). 7.5 hours

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