Time and Work 2

Q:

?A and B together can do a piece of work in 18 days, B and C in 24 days, and A and C in 36 days. The number of days, all of them working together take to complete the work, is-?

  1. ?18?
  2. ?16?
  3. ?17?
  4. ?15?
  5. 23
Level:

?

$\frac12$

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