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     EduGorilla 
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    Pipe X can fill a tank in 20 hours and Pipe Y can fill the tank in 35 hours. Both the pipes are opened on alternate hours. Pipe Y is opened first, then in howmuch time (in hours) the tank will be full?
    पाइप X एक टैंक को 20 घंटों में भर सकता है और पाइप Y एक टैंक को 35 घंटों में भर सकता है। दोनों पाइपों को वैकल्पिक घंटो में खोला जाता है। यदि पहले पाइप Y को खोला जाता है, तो कितने समय(घंटों में) में टैंक पूरा भर जायेगा? 

    Options :-

    1. 269/11 

    2. 280/11 

    3. 179/7 

    4. 172/7 

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