Mathematics · Work and Time
दो पाइप, P और Q, मिलकर एक टैंक को 4 घंटे में भर सकते हैं। यदि अकेला पाइप P उसी टैंक को 8 घंटे में भर सकता है, तो अकेला पाइप Q उसी टैंक को भरने में कितना समय (घंटों में) लेगा?
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