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एक कुण्ड किसी नल के द्वारा 4 घण्टे में भरा जा सकता है‚ जबकि इसे खाली करने में दूसरे नल को 9 घण्टे लगते हैं। यदि इन दोनों नलों को साथ-साथ खोला जाए‚ तो कितने समय के पश्चात्‌ कुण्ड भर जाएगा? A cistern can be filled by a tap in 4 h while it can be empitied by another tap in 9 h. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

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एक कुण्ड किसी नल के द्वारा 4 घण्टे में भरा जा सकता है‚ जबकि इसे खाली करने में दूसरे नल को 9 घण्टे लगते हैं। यदि इन दोनों नलों को साथ-साथ खोला जाए‚ तो कितने समय के पश्चात्‌ कुण्ड भर जाएगा? A cistern can be filled by a tap in 4 h while it can be empitied by another tap in 9 h. If both the taps are opened simultaneously, then after how much time will the cistern get filled?






 
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