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NIELIT 2022 Feb Scientist D - Section D: 15

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$\text{A, B}$ and $\text{C}$ can do a piece of work in $24, 30$ and $40$ days respectively. They began the work together but $\text{C}$ left $10$ days before completion of the work. In how many days was the work done ?

  1. $11$ days
  2. $11.5$ days
  3. $12.5$ days
  4. $12$ days
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