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    Question

    The speed of the boat upstream and downstream are in

    the ratio of 3:4. If the boat covers a distance of 147 km in still water in 7 hours, determine the speed of the stream.
    A 2.5 km/hr Correct Answer Incorrect Answer
    B 3 km/hr Correct Answer Incorrect Answer
    C 3.5 km/hr Correct Answer Incorrect Answer
    D 4 km/hr Correct Answer Incorrect Answer
    E Cannot be determined Correct Answer Incorrect Answer

    Solution

    Speed of the boat in still water = 147/7 = 21 km/h Let the speed of the stream be тАШxтАЩ years According to question: (21 тАУ x)/(21 + x) = 3/4 84 тАУ 4x = 63 + 3x 7x = 21 x = 3 So the speed of the stream = 3 km/h

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