Mathematics · Pipes and Cisterns

पाइप A और B एक खाली टंकी को क्रमशः 84 मिनट और 36 मिनट में भर सकते हैं। दोनों पाइप A और B को एक साथ खोला जाता है। पाइप B को कितने समय बाद बंद कर दिया जाना चाहिए ताकि खाली टंकी कुल 42 मिनट में पूरी तरह भर जाए?

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18 मिनट

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