Mathematics · Time and Work
दो पाइप एक टैंक को क्रमशः 12 घंटे और 18 घंटे में भर सकते हैं, जबकि एक तीसरा पाइप इसे 8 घंटे में खाली कर सकता है। यदि तीनों पाइपों को एक साथ खोल दिया जाए, तो खाली टैंक को भरने में कितना समय (घंटों में) लगेगा?
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