Mathematics · Time and Work
एक खाली तालाब को भरने के लिए दो पाइप A और B लगाए जाते हैं। पाइप A अकेला तालाब को 70 घंटे में भर सकता है और पाइप B अकेला इसे 80 घंटे में भर सकता है। यदि दोनों पाइपों को एक साथ खोल दिया जाए, तो तालाब को भरने में कितना समय लगेगा?
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