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    Question

    Komal and Seema individually can complete a task in

    ‘2a’ hours and ‘7a’ hours respectively. If they together can complete half of the work in 7 hours, then find the value of ‘a’.
    A 4 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 6 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer
    E 9 Correct Answer Incorrect Answer

    Solution

    According to the question, => 7 x [(1/2a) + (1/7a)] = 1/2 => 7 x (9/14a) = 1/2 => a = 9

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