6. A tank is fitted with two taps. The f...

6. A tank is fitted with two taps. The first tap can fill the tank completely in 45 minutes and the second tap can empty the full tank in one hour. If both the taps are opened alternately for one minute, then in how many hours the empty tank will be filled completely ? एक टंकी में दो नल लगे है, पहला नल टंकी को पूर्णतया 45 मिनट में भरता है और दूसरा नल किसी टैंक को 1 घंटे में खाली करता है। यदि दोनों पाइपो को बारी-बारी से एक-एक मिनट के लिए खोला जाता है तो खाली टंकी को पूर्णतया भरने में कितना समय लगेगा?

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