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

    Question

    A boat takes 7 hours to cover 231 km upstream and 9

    hours to cover 387 km downstream. Find the time taken by the boat to cover 546 km upstream and 495 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.
    A 24 hours Correct Answer Incorrect Answer
    B 26 hours Correct Answer Incorrect Answer
    C 22 hours Correct Answer Incorrect Answer
    D 25 hours Correct Answer Incorrect Answer

    Solution

    Upstream speed = 231/7 = 33 km/h Downstream speed = 387/9 = 43 km/h Speed of boat in still water = (33 + 43)/2 = 38 km/h   Speed of stream = (43 – 33)/2 = 5 km/h Increased speed of boat in still water = 38 + 4 = 42 km/h Decreased speed of stream = 5 – 2 = 3 km/h Required time taken = 546/(42 – 3) + 495/(43 + 3) = 14 + 11 = 25 hours

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