Mathematics · Work and Time
एक पाइप एक टंकी को 6 घंटे में भर सकता है। तल में एक रिसाव (leak) के कारण टंकी को भरने में 7 घंटे का समय लगता है। रिसाव के बिंदु से पूरी तरह भरी हुई टंकी कितने समय में खाली की जा सकती है?
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