Mathematics · Time and Work
नल A एक टैंक को चार घंटे में भर सकता है जबकि नल B उसी टैंक को छह घंटे में पूरी तरह खाली कर सकता है। यदि दोनों नलों को एक ही समय पर खुला रखा जाए, तो टैंक कितने समय में भर जाएगा?
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