Mathematics · Time and Work
पाइप A एक टैंक को 840 मिनट में भर सकता है और पाइप B उसी टैंक को 1050 मिनट में खाली कर सकता है। यदि दोनों पाइपों को एक साथ खोल दिया जाए, तो खाली टैंक को भरने में कितने घंटे लगेंगे?
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