1 . 3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
- A. 9
- B. 10
- C. 11
- D. 12
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সমন্বিত পাঁচ ব্যাংক || অফিসার ক্যাশ - 06.11.2021
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