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Railways Sample Paper RRB (Group D) Sample Test Paper-1

  • question_answer
    A can complete a piece of work in 18 days, B in 20 days and C in 30 days, B and C together start the work and are forced to leave after 2 days. The time taken by A alone to complete the remaining work is

    A)  10 days           

    B)  12 days

    C)  15 days           

    D)  16 days

    Correct Answer: C

    Solution :

    [c] (B+C)'s 2 day?s work \[=\left( \frac{1}{20}+\frac{1}{30} \right)=2\left( \frac{3+2}{60} \right)=\frac{1}{6}part\] Remaining work \[=1-\,\frac{1}{6}=\frac{5}{6}part\] \[\therefore \] Time taken by A to complete this part of work \[=\frac{5}{6}\times 18=15\,days\]


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