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    Question

    If the sum of upstream and downstream speed is 22 km/hr

    and the speed of the current is 4 km/hr. Then find time taken to cover 60 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 4 hrs Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water be x km/hr. According to the question, => x + 4 + x − 4 = 22 => x = 11 Downstream speed = 4 + 11 = 15 km/hr Required time = 60/15 = 4 hrs

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