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    Question

    'K' can do 3/4th of a work in 6 days and 'J'

    can do 2/5th of the same work in 4 days. How long (in days) will they take, if they work together to finish the work?
    A 4 2/3 Correct Answer Incorrect Answer
    B 4 3/8 Correct Answer Incorrect Answer
    C 4 1/4 Correct Answer Incorrect Answer
    D 4 4/9 Correct Answer Incorrect Answer

    Solution

    K can do 3/4 work in 6 days So, K can do a work in 6 x 4 / 3 days = 8 days similarly, J can do a work in 4 x 5 / 2 days = 10 days working together = 1/8 + 1/10 = 5 + 4 / 40 = 9/40 = 4 (4/9) days

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