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

    Question

    The speed of boat in still water is 48 kmph. If it takes

    5 hour to go upstream 40 kms, in what time approximately will it return same distance downstream?
    A 53 min Correct Answer Incorrect Answer
    B 46 min Correct Answer Incorrect Answer
    C 33 min Correct Answer Incorrect Answer
    D 27 min Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Distance = 40 km Time taken to go upstream = 5 hour ∴ Speed upstream = 40/5 = 8 km/hr ∴ Speed of the current = 48 – 8 = 40 km/hr ∴ Speed downstream = 48 + 40 = 88 km/hr ∴ Time taken to go downstream = 40/88 = 5/11 hr ⇒ 5/11 x 60 minutes = 27 minutes approx..

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