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    Question

    A boat takes 12 hours to cover 's' km in still water.

    While traveling downstream, it takes 8 hours to cover (s - 32) km. If the speed of the boat in still water is 4 times the speed of the stream, find the speed of the stream.
    A 18 km/h Correct Answer Incorrect Answer
    B 4 km/h Correct Answer Incorrect Answer
    C 8 km/h Correct Answer Incorrect Answer
    D 15 km/h Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the speed of the stream be = u km/h. Speed of the boat in still water = 4u km/h. Using the equation:    Downstream speed =  4u +  u = 5v km/h. Using the downstream equation:     From equations (I) and (II):       Thus, the speed of the stream is 4 km/h.

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