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PIPES AND CISTERNS
1.INLET:A pipe connected with a tank or cistern or a reservoir, that fills
               it, it is known as Inlet.

  OUTLET:A pipe connected with a tank or a cistern or a reservoir, emptying
                it, is known as Outlet.

2. i) If a pipe can fill a tank in x hours, then :
          part filled in 1 hour=1/x.

   ii)If a pipe can empty a tank in y hours, then :
        part emptied in 1 hour=1/y.

   iii)If a pipe can fill a tank in x hours and another pipe can empty the full 
       tank in y hours( where y>x), then on opening both the pipes, the net part
       filled in 1 hour=(1/x -1/y).

   iv)If a pipe can fill a tank in x hours and another pipe can empty the full 
      tank in y hours( where x>y), then on opening both the pipes, the net part
      filled in 1 hour=(1/y -1/x).

   v) If two pipes A and B can fill a tank in x hours and y hours respectively. 
      If both the pipes are opened simultaneously, part filled by A+B in 
      1 hour= 1/x +1/y.

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