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Q:

A and B working together, can do a piece of work in $$ {4{1\over 2}}$$ hours. B and C working together can do it in 3 hours. C and A working together can do it in $$ {2{1\over 4}}$$ hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work?

  • 1
    3 hours
  • 2
    2 hours
  • 3
    2.5 hours
  • 4
    1 hours
  • 5
    None of these
  • Show Answer
  • Workspace

Answer : 2. "2 hours"

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