New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A’ and ‘B’ together can complete a work in 15 days

    while ‘A’ takes 20 days to complete the same work alone. If ‘C’ is 50% more efficient than ‘B’, then find the time taken by ‘C’ alone to complete the whole work.
    A 24days Correct Answer Incorrect Answer
    B 40days Correct Answer Incorrect Answer
    C 29 days Correct Answer Incorrect Answer
    D 25 days Correct Answer Incorrect Answer
    E 26 days Correct Answer Incorrect Answer

    Solution

    Let the total work = 60 units Efficiency of (A + B) = 60/15 = 4 units/day Efficiency of ‘A’ = 60/20 = 3 units/day Therefore, efficiency of ‘B’ = 4 – 3 = 1 unit/day Efficiency of ‘C’ = 1.5 × 1 = 1.5 units/day Required time taken = 60/1.5 = 40 days

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