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Q: A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ?

  • 1
    14 1/2 days
  • 2
    11 days
  • 3
    13 1/4 days
  • 4
    12 6/7 days
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Answer : 4. "12 6/7 days"
Explanation :

Answer: D) 12 6/7 days Explanation: Let 'B' alone can do the work in 'x' days 6/30 + 18/x = 1 => x = 22.5   1/30 + 1/22.5 = 7/90  => 90/7 = 12 6/7 days

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