Multiple Choice Questions on Ravi can row 12 kmph in still water when the river is running at 6 kmph it takes him 1 hour to row t........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Ravi can row 12 kmph in still water when the river is running at 6 kmph it takes him 1 hour to row t...........

Quantitative Aptitude ( CCS) Boats and Streams
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    Ravi can row 12 kmph in still water when the river is running at 6 kmph it takes him 1 hour to row to a place and to come back. How far is the place?

    5.5 km

    Incorrect Answer

    4.5 km

    Correct Answer

    8.2 km

    Incorrect Answer

    4.2 km

    Incorrect Answer
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    Explanation:

    Option B
    Solution: 
    Downstream Speed = 18 kmph
    Upstream Speed = 6 kmph
    Distance = x
    x/18 + x/6 = 1
    18x + 6x = 108
    24x = 108
    x = 4.5 km
    OR USE FORMULA:
    Distance = time [B2 – R2]/2*B
    So distance = 1 * [122 – 62]/2*12
    Distance = 108/24 = 4.5 km

    By: Sandeep Dubey
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