Mathematics · Pipes and Cisterns
नल A एक टंकी को 282 घंटे में खाली कर सकता है जबकि नल B इसे 423 घंटे में भर सकता है। यदि A और B दोनों को एक साथ खोल दिया जाए, तो भरी हुई टंकी कितने घंटों में खाली हो जाएगी?
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