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

    Question

    When travelling downstream, a boat takes 6.25 hours to

    travel 275 km. If the speed of the stream is (4/11)th of downstream speed of the boat, then find the time taken by the boat to cover 308 km in still water.
    A 11 hours Correct Answer Incorrect Answer
    B 9 hours Correct Answer Incorrect Answer
    C 10 hours Correct Answer Incorrect Answer
    D 14 hours Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 275/6.25 = 44 km/hr Speed of the stream = 44 x (4/11) = 16 km/hr So, speed of the boat in still water = 44 – 16 = 28 km/hr Required time taken = 308/28 = 11 hours

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