Mathematics · Time and Work

एक पाइप टैंक को 8 मिनट में भर सकता है जबकि दूसरा पाइप पूरी तरह भरे हुए टैंक को 11 मिनट में खाली कर सकता है। यदि दोनों पाइपों को खाली टैंक पर एक साथ चलाया जाए, तो टैंक के तीन-चौथाई हिस्से को भरने में कितना समय (मिनट में) लगेगा?

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