Pipes and Cisterns Questions Answers Formulas, Tips and Tricks

• 1. Pipes and Cisterns important facts and formulae

  
  

  1. Inlet:
  
  A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet.
  
  2. Outlet:
  
  A pipe connected with a tank or cistern or reservoir, emptying it, is known as an outlet.
  
  3. If a pipe can fill a tank in x hours, then:
  
  part filled in 1 hour =

  $$\begin{aligned}\frac{1}{x}\end{aligned}$$
  
  4. If a pipe can empty a tank in y hours, then:
  
  part emptied in 1 hour = $$\begin{aligned}\frac{1}{y}\end{aligned}$$
  
  5. 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, then
  
  the net part filled in 1 hour = $$\begin{aligned}\frac{1}{x}-\frac{1}{y} \end{aligned}$$
  
  6. 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, then
  
  the net part emptied in 1 hour = $$\begin{aligned}\frac{1}{y}-\frac{1}{x} \end{aligned}$$

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Pipes and Cisterns Questions Answers