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    Question

    If the sum of upstream and downstream speed is 30 km/hr

    and the speed of the current is 6 km/hr. Then find time taken to cover 84 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 + 6 + x − 6 = 30 => x = 15 Downstream speed = 6 + 15 = 21 km/hr Required time = 84/21 = 4 hrs

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