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  • Question
  • There is an empty reservoir whose capacity is 30 litres. There is an inlet pipe which fills at 5 L/min and there is an outlet pipe which empties at 4 L/min. Both the pipes function alternately for 1 minute. Assuming that the inlet pipe is the first one to function, how much time will it take for the reservoir to be filled up to its capacity?


  • Options
  • A. 49.5 min
  • B. 50 min
  • C. 51 min
  • D. 52 min

  • Correct Answer
  • 51 min 

    Explanation

    The work to be done = Capacity of reservoir  = 30 litres.

     1st Minute ---> inlet pipe opened ---> 5 lit filled

     2nd minute ---> inlet pipe closed; outlet pipe opened ---> 4 lit emptied

     

    In 2 minutes (5 litres - 4 litres = 1lit) is filled into the reservoir.

    It takes 2 minutes to fill 1lit ---> it takes 50 minutes to fill 25 litres into the reservoir.  

     

    In the 51st minute inlet pipe is opened and the reservoir is filled.

  • Tags: CAT, Bank PO

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