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Railways Sample Paper RRB (Group D) Sample Test Paper-9

  • question_answer
    A and B together can do a piece of work in 6 days. If A can alone do the work in 18 days, then the number of days required for B to finish the work is

    A)  12       

    B)  9

    C)  15                   

    D)  10

    Correct Answer: B

    Solution :

    [b] A and B can complete work in 6 days A can complete in 18 days Let B can complete in x days \[\therefore \] One day work be equal to \[\frac{1}{6}=\frac{1}{18}+\frac{1}{x}\] \[\frac{1}{6}=\frac{x+18}{18x}\] \[3x=x+18\] \[x=9\,\,days\]


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