Mathematics · Work and Time
पाइप A एक टैंक को 816 मिनट में भर सकता है और पाइप B उसी टैंक को 1020 मिनट में खाली कर सकता है। यदि दोनों पाइपों को एक साथ खोल दिया जाता है, तो खाली टैंक को भरने में कितने घंटे लगेंगे?
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