Multiple Choice Questions on A boat can go 20 km downstream and 30 km upstream in 2 hours 20 minutes Also it can go 10 km downstr........... for SSC (CPO) Exam Preparation

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Multiple Choice Questions

A boat can go 20 km downstream and 30 km upstream in 2 hours 20 minutes Also it can go 10 km downstr...........

Quantitative Aptitude (CPO) Boats and Streams
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    A boat can go 20 km downstream and 30 km upstream in 2 hours 20 minutes. Also, it can go 10 km downstream and 8 km upstream in 49 minutes. What is the speed of boat downstream in km/h?

    This questions was previously asked in
    SSC CPO 13th-March-2019-Shift-1
    View All SSCCPO Previous Year Papers

    18

    Incorrect Answer

    20

    Incorrect Answer

    16

    Incorrect Answer

    24

    Correct Answer
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    Explanation:

    Correct option:4

    Solution: According to the given statement

    20/ds +30/us=2 hr 20 min=7/3

    20/ds +30/us=7/3-------------(1)

    10/ds+8/us=49/60------------(2)   x  2

    20/ds+16/us=49/30-----------(3)

    Subtract eq(3) from eq(1)

    14/us=21/30 => us=20

    Ds= 24 km/h

    Hence correct answer is 24 km/h

    By: santosh
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