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    Question

    A boat takes 24 hours to cover 'q' km in still water.

    While traveling downstream, it takes 16 hours to cover (q - 80) km. If the speed of the boat in still water is 4 times the speed of the stream, then find the speed of the stream.
    A 20 km/h Correct Answer Incorrect Answer
    B 5 km/h Correct Answer Incorrect Answer
    C 12 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 = v km/h. Speed of the boat in still water = 4v km/h. Using the equation:   Downstream speed =  4v +  v = 5v km/h. Using the downstream equation:    From equations (I) and (II):      Thus, the speed of the stream is 5 km/h.

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