Mathematics · Time and Work
पंप A एक पानी की टंकी को 4 घंटे में भर सकता है और पंप B उसी टंकी को 7 घंटे में भर सकता है। दोनों पंपों को एक साथ काम करने पर टंकी को भरने में लगभग कितना समय लगेगा?
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