Bhanu Chaudhary
Poll
Professional
Asked: 2022-03-09T19:08:44+05:30

Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes, C is also opened. The tank is filled up in

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Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes, C is also opened. The tank is filled up in

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    1 Answer

    1. Professional

      Correct Answer: 46 minutes

      1/36+1/45+1/30

      =5+4+6/180

       

       

      (A + B)’s 7 minutes filling =(5+4)×7=63 units

       

      Remaining capacity =180−63=117 units

       

      Now C is opened, it empties by 6 units/min.

       

      So total units filled in tank is =(5+4)−6=3 units/min

       

      Now tank can be filled in

       

      =117/3=39min

       

      Tank is filled up in

       

      = 7+39 minutes=46 min

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