Multiple Choice Questions on A boat goes 12 km downstream and comes back to the starting point in 3 hours if the speed of the cur........... for Employee State Insurance Corporation (ESIC) Exam Preparation

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Multiple Choice Questions

A boat goes 12 km downstream and comes back to the starting point in 3 hours if the speed of the cur...........

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    A boat goes 12 km downstream and comes back to the starting point in 3 hours . if the speed of the current is 3 km/hr, then the speed of the boat in still water is

    12 km/h

    Incorrect Answer

    9 km/h

    Correct Answer

    8 km/h

    Incorrect Answer

    6 km/h

    Incorrect Answer
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    Explanation:

    T = 2xD/(x2 – y2),
    3 = 2 × x × 12/(x2 - 32)
    3 (x2 - 9) = 24x
    x2 – 8x – 9 = 0
     x = 9 – 1
    x = 9 km/hr

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