Mathematics · Time and Work
पाइप A और B एक टैंक को क्रमशः 18 घंटे और 27 घंटे में भर सकते हैं। यदि दोनों पाइपों को एक-एक करके एकांतर घंटों (alternate hours) के लिए खोला जाता है, और पहले घंटे के लिए पाइप A को खोला जाता है, तो टैंक कितने घंटों में पूरी तरह से भर जाएगा?
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