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    Question

    The speed of the stream is 16 km/h. Boat ‘A’ covers

    128 km distance against the stream in 4 hours and boat ‘B’ covers 70 km distance against the stream in 5 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?
    A 52.5% Correct Answer Incorrect Answer
    B 42.5% Correct Answer Incorrect Answer
    C 62.5% Correct Answer Incorrect Answer
    D 60.5% Correct Answer Incorrect Answer
    E 69.5% Correct Answer Incorrect Answer

    Solution

    Speed of boat ‘A’ upstream = 128/4 = 32 km/h Speed of boat ‘B’ upstream = 70/5 = 14 km/h Speed of the boat ‘A’ in still water = 32 + 16 = 48 km/h Speed of the boat ‘B’ in still water = 14 + 16 = 30 km/h Required percentage = (30/48) × 100 = 62.5%

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