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    Question

    A’ and β€˜B’ together can complete a work in 10 days

    while β€˜A’ takes 30 days to complete the same work alone. If β€˜C’ is 50% more efficient than β€˜B’, then find the time taken by β€˜C’ alone to complete the whole work.
    A 12 days Correct Answer Incorrect Answer
    B 9 days Correct Answer Incorrect Answer
    C 10 days Correct Answer Incorrect Answer
    D 8 days Correct Answer Incorrect Answer

    Solution

    Let the total work = 30 units Efficiency of (A + B) = 30/10 = 3 units/day Efficiency of β€˜A’ = 30/30 = 1 unit/day Therefore, efficiency of β€˜B’ = 3 – 1 = 2 units/day Efficiency of β€˜C’ = 1.5 Γ— 2 = 3 units/day Required time taken = 30/3 = 10 days

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