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Pump one can fill tank to 1/3 capacity in 45 minutes Pump 2 [#permalink]
26 Aug 2007, 05:24
Pump one can fill tank to 1/3 capacity in 45 minutes
Pump 2 can fill it to 2/3 capacity in 2 hours
Pump 3, a pump that pumps the tank out and unfill it in 1.5 hours
How long would it take to fill the tank if all 3 were working at same time?