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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-5

  • question_answer
    A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. When they work together, the time required will be

    A)  20 days           

    B)  13 days

    C)  15 days           

    D)  10 days

    Correct Answer: D

    Solution :

    (A + B)?s one day work \[=\frac{1}{2}\] (B + C)?s one day work \[=\frac{1}{15}\] and (C + A)?s one day work\[=\frac{1}{20}\] \[\therefore \] 2 (A + B + C)?s one day work \[=\frac{1}{12}+\frac{1}{15}+\frac{1}{20}=\frac{5+4+3}{60}\] \[=\frac{12}{60}=\frac{1}{5}\] \[\Rightarrow \] (A+ B+ C)?s one day work \[\frac{1}{10}\] So, A, B and C, together can do the work in 10 days.


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