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    Question

    A can finish a job in 15 days and B can finish the same

    job in 20 days. In how many days can they finish it working together?
    A 6 days Correct Answer Incorrect Answer
    B 7.5 days Correct Answer Incorrect Answer
    C 60/7 days Correct Answer Incorrect Answer
    D 10 days Correct Answer Incorrect Answer

    Solution

    ATQ, Let total work = 60 units (LCM of 15 and 20). A’s rate = 60/15 = 4 units/day B’s rate = 60/20 = 3 units/day Together = 4 + 3 = 7 units/day Time = 60 / 7 days

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