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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 ?

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Answer: Option C

Explanation:

3 pumps 2 days empties by working 8 hrs

1 " 2 " " " " ( 8 × 3) hrs

1 " 1 " " " " ( 8 × 3 × 2) hrs

4 " 1 " " " " ( 8 × 3 × 2) /4 hrs

= 12 hrs

Bangladesh Bank - Officer(Cash) - 2016