three pumps working 8 hours can empty in 2 day . how many hours a day must pumps work to empty the tank in 1 day
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If three pumps working together 8 hours a day can empty a tank in 2 days. it means the volume of the tank is such that it requires pumping of 3*8*2 = 48 pump-day-hours. 48 pump-day-hours/4 pump-day = 12 hours. So 4 pumps working 12 hours a day can empty the tank in one day.
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