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    Question

    If the sum of upstream and downstream speed is 24 km/hr

    and the speed of the current is 5 km/hr. Then find time taken to cover 51 km in downward?
    A 2 hrs Correct Answer Incorrect Answer
    B 2.5 hrs Correct Answer Incorrect Answer
    C 3 hrs Correct Answer Incorrect Answer
    D 3.5 hrs Correct Answer Incorrect Answer
    E 4 hrs Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water be x km/hr. According to the question, => x + 5 + x − 5 = 24 => x = 12 Downstream speed = 5 + 12 = 17 km/hr Required time = 51/17 = 3 hrs

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