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    Question

    Two pipes G and H can fill a cistern in 40 minutes and

    50 minutes respectively. If both are opened together, after how many minutes should pipe G be shut off so that pipe H alone can finish filling the cistern in 5 minutes?
    A 22 min Correct Answer Incorrect Answer
    B 15 min Correct Answer Incorrect Answer
    C 20 min Correct Answer Incorrect Answer
    D 12 min Correct Answer Incorrect Answer

    Solution

    ATQ, Pipe G should be closed after 20 minutes.

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