Practice Test Discussion


A is thrice as good a workman as B and therefore is able to finish a job in 30 days less than B. How many days will they take to finishthe job working together?

[Railways 2007]

  • Explanation

    Let A take a and B take 3a days to finish the work.

    As per the question,


      x=302=15 days

    Time taken by B to complete the work is 3a

    So 3×15=45 days

    Therefore 1 day work of (A+B)= 115+145=3+145=445

    Hence, (A+B) will finish the work in 454 or 1114days

    Hence option C is correct


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