1 . A cistern is normally filled with eater in 10 hours but takes 5 hours longer to fill because of a leak in its bottom . If the cistern is full, the leak will empty the cistern in -
- A. 20 hours
- B. 30 hours
- C. 40 hours
- D. 50 hours
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জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯
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