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Two tap can fill a cistern in 8 hours and 10 hours respectively. A third tap can empty it in 6 hours. How long will they take to fill the cistern if all the taps are opened.

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दो टैप क्रमशः 8 घंटे और 10 घंटे में एक सिटर भर सकते हैं। एक तिहाई टैप इसे 6 घंटे में खाली कर सकता है। यदि सभी नलियां खोली जाती हैं तो वे कब तक भरने के लिए कितना समय लगेगा।

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