Mathematics · Time and Work
दो पाइप A और B एक टैंक को क्रमशः 8 घंटे और 12 घंटे में भर सकते हैं, जबकि एक तीसरा पाइप C भरे हुए टैंक को 9 घंटे में खाली कर सकता है। यदि तीनों पाइपों को एक साथ खोल दिया जाए, तो टैंक को भरने में कितना समय (घंटों में) लगेगा?
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