Question

    The speed of current is 12 km/hr. If the speed of the

    boat in still water had been 15 km/hr more than the original speed, then it would take 9 hours to cover 567 km in downstream. Find the original speed of the boat in still water (in km/hr).
    A 45 km/hr Correct Answer Incorrect Answer
    B 36 km/hr Correct Answer Incorrect Answer
    C 30 km/hr Correct Answer Incorrect Answer
    D 20 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the speed of the boat in still water be ‘x’ km/hr. According to the question, (x + 15 + 12) = 567 / 9 Or, x + 27 = 63 So, x = 63 - 27 = 36 km/hr

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