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

    Question

    The speed of the stream is 12 km/h. Boat ‘A’ covers

    160 km distance against the stream in 8 hours and boat ‘B’ covers 84 km distance against the stream in 7 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?
    A 70% Correct Answer Incorrect Answer
    B 30% Correct Answer Incorrect Answer
    C 60% Correct Answer Incorrect Answer
    D 75% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of boat ‘A’ upstream = 160/8 = 20 km/h Speed of boat ‘B’ upstream = 84/7 = 12 km/h Speed of the boat ‘A’ in still water = 20 + 12 = 32 km/h Speed of the boat ‘B’ in still water = 12 + 12 = 24 km/h Required percentage = (24/32) × 100 = 75%

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