Multiple Choice Questions on Rani can row 8 kmph in still water If the river is running at 4 kmph it takes 90 minutes to row to a........... for Graduation cum Career Security Preparation

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Multiple Choice Questions

Rani can row 8 kmph in still water If the river is running at 4 kmph it takes 90 minutes to row to a...........

Quantitative Aptitude (CCS) Boats and Streams
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    Rani can row 8 kmph in still water. If the river is running at 4 kmph it takes 90 minutes to row to a place and back. How far is the place?

    4.5 km

    Correct Answer

    8.2 km

    Incorrect Answer

    4.2 km

    Incorrect Answer

    3.5 km

    Incorrect Answer
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    Explanation:

    Option A
    Solution: 
    Speed in still water = 8 kmph
    Speed of the stream = 4 kmph
    Upstream Speed = (8-4) = 4 kmph
    Downstream Speed = (8+4) = 12 kmph
    Total time = 90 minutes = 90/60 = 3/2 hrs
    Let x is the distance
    x/12 + x/4 = 3/2
    x = 4.5 km

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