Mathematics · Time and Work
दो पाइप A और B एक टैंक को क्रमशः 20 मिनट और 15 मिनट में भर सकते हैं। दोनों पाइपों को एक साथ खोला जाता है लेकिन 2 मिनट के बाद पाइप A को बंद कर दिया जाता है। टैंक के शेष भाग को भरने में कितना समय (मिनटों में) लगेगा?
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