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      Question

      A man can do a piece of work in 30 hours. If he works

      with his son then the same piece of work is finished in 20 hours. If the son works alone he can do the work in
      A 60 hours Correct Answer Incorrect Answer
      B 50 hours Correct Answer Incorrect Answer
      C 25 hours Correct Answer Incorrect Answer
      D 10 hours Correct Answer Incorrect Answer

      Solution

      Given that man can do a work in 30 hr In 1hr, work done by Man = 1/30 Along with Son, Man can do work in 20 hr In 1hr, work done by Man and Son = 1/20 => In 1hr, work done by son = 1/20 – 1/30 => work done by son in 1hr = 1/60 Therefore, son takes 60hr to complete the work.

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