Math, asked by rahulsuhanigupta07, 5 months ago

20. दो नल किसी टंकी को क्रमश: 6 तथा 12 घंटे में भर सकता है। यदि दोनों
नल एक साथ खोल दिए जाए, तो टंकी भरने में कितना समय लगेगा?

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