New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    The speed of the stream is 11 km/h. Boat ‘A’ covers

    84 km distance against the stream in 6 hours and boat ‘B’ covers 90 km distance against the stream in 3 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?
    A 104% Correct Answer Incorrect Answer
    B 154% Correct Answer Incorrect Answer
    C 164% Correct Answer Incorrect Answer
    D 174% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of boat ‘A’ upstream = 84/6 = 14 km/h Speed of boat ‘B’ upstream = 90/3 = 30 km/h Speed of the boat ‘A’ in still water = 14 + 11 = 25 km/h Speed of the boat ‘B’ in still water = 30 + 11 = 41 km/h Required percentage = (41/25) × 100 = 164%

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