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Study the following graph carefully to answer the given questions

Q:

 T and V started the work. After 3 days Z joined them, who can complete alone the same whole work in 3 days. What is the total number of days in which they had completed the work?

  • 1
    12
  • 2
    8
  • 3
    4
  • 4
    6
  • 5
    None of these
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Answer : 3. "4"

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