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

    Question

    A and B together can finish a task in 35 days. If B is

    40% more efficient than A, how many days will it take for B alone to complete the task?
    A 48 days Correct Answer Incorrect Answer
    B 60 days Correct Answer Incorrect Answer
    C 72 days Correct Answer Incorrect Answer
    D 84 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the amount of work done by A alone in one day be ‘x’ units So the amount of work done by B alone in one day = 1.4x units So the total work = 35 × (x + 1.4x) = 84x units Time taken by B alone to complete the work = 84x/1.4x = 60 days

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