Mathematics · Work and Time

पाइप A और B एक आयताकार टैंक को क्रमशः 40 मिनट और 120 मिनट में भर सकते हैं। पाइप C उसी पूरी तरह से भरे हुए टैंक को 240 मिनट में खाली कर सकता है। यदि पाइप A, B और C को एक ही समय पर खोला जाता है, तो खाली टैंक को भरने में कितने मिनट का समय लगेगा?

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