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     EduGorilla 
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    A person can row 9  km./hr. in still water. He finds that it takes twice the time to row upstream than the time to row downstream. The speed of the stream is-

    Options :-

    1. 4 km/hr
    2. 4.5 km/hr
    3. 3 km/hr
    4. 2 km/hr
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