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3 pumps,working 8 hours a day,can empty a tank in 2 days. how many hours a day 4 pumps works to empty the tank in 1 day?

12 hours
yes u are right


3 pumps work for 8 hours everday and complete the work in 2 days
1 pump in 1 hr can finish  \frac{1}{48}th piece of work
so 4 pumps in one day can finish the work in x hours
 \frac{1}{4x}= \frac{1}{48}=   1 pump in 1 hr can finish
x= \frac{48}{4}=12
So 4 pumps in 12 hours can finsh the work

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