Question

    'Kiran' alone can finish a task in 25 days. 'Mohan' is 80%

    more efficient than Kiran. They start the work together but Kiran stops after 7 days. How many more days are needed by Mohan to complete the task?
    A 10 days Correct Answer Incorrect Answer
    B 3 days Correct Answer Incorrect Answer
    C 18 days Correct Answer Incorrect Answer
    D 5 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let efficiency of Kiran = '5x' units/day

    Efficiency of Mohan = 5x × (1.8) = 9x units/day

    Total work = 5x × 25 = 125x units

    Work done in 7 days = (5x + 9x) × 7 = 98x units

    Remaining work = 125x - 98x = 27x units

    Time by Mohan = 27x ÷ 9x = 3 days

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