Mathematics · Time and Work
दो पाइप एक टैंक को क्रमशः 20 घंटे और 60 घंटे में भर सकते हैं। एक तीसरा पाइप एक निकास (आउटलेट) पाइप है। यदि तीनों पाइपों को एक साथ खोल दिया जाता है, तो टैंक 40 घंटे में भर जाता है। अकेला निकास पाइप पूरे भरे हुए टैंक को खाली करने में कितना समय लेगा?
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