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    Question

    If the sum of upstream and downstream speed is 18 km/hr

    and the speed of the current is 4 km/hr. Then find time taken to cover 39 km in downward? Section 4
    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 + 4 + x − 4 = 18 => x = 9 Downstream speed = 4 + 9 = 13 km/hr Required time = 39/13 = 3 hrs

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