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    Question

    Rohan can finish a certain task in 18 days, whereas

    Rohan and Karan together can complete it in 4.5 days. How many days will Karan alone take to complete the task?
    A 4/5 Correct Answer Incorrect Answer
    B 9/2 Correct Answer Incorrect Answer
    C 6/5 Correct Answer Incorrect Answer
    D 5/3 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ;
    Rohan and Karan together take 9/2 days.

    Time taken by Karan alone to complete the task =1/[(2/9) - (1/18)] = 1/(4/18) = 18/4 = 9/2

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