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Railways Sample Paper RRB (Group D) Sample Test Paper-5

  • question_answer
    A can do a work in 20 days and B can do the same work in 30 days. In how many days can A and B together do the work?

    A)  15                   

    B)  16

    C)  10       

    D)  12

    Correct Answer: D

    Solution :

    [d] A's 1 day's work \[=\frac{1}{20}\] B's 1 day's work \[=\frac{1}{30}\] (A+B)'s l day?s work\[=\left( \frac{1}{20}+\frac{1}{30} \right)=\frac{5}{60}\] \[\therefore \]Both A and B will finish the work in \[\frac{60}{5}=12\]days.


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