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?<br>

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?

[Pubali Bank Junior Officer -2013 : 2013]

1. 9

2. 10

3. 11

4. 12

5. None of them

Answer

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