ArithmeticTwo pipes X and Y can fill and empty cistern in 10 and 15 mints respectively. How long will it take to fill the empty cistern, if both the pipes are opened.

Two pipes X and Y can fill and empty cistern in 10 and 15 mints respectively. How long will it take to fill the empty cistern, if both the pipes are opened.

  1. A

    20 min

  2. B

    25 min

  3. C

    30 min

  4. D

    35 min

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    Solution:

    X can fill the cistern = 10 min

    Y can empty the cistern = 15 min

    if, both are opened = 110- 115

     =3 - 230 

       = 130                          

      So, 30 min to fill the cistern

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