Multiple Choice Questions on A sailor can row a boat 8 km down stream and return back to the starting point in 1 hour 40 minutes ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A sailor can row a boat 8 km down stream and return back to the starting point in 1 hour 40 minutes ...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A sailor can row a boat 8 km down stream and return back to the starting point in 1 hour 40 minutes. If the speed of the stream is 2 km/hr, then the speed of the boat in still water is

    5 km/hr

    Incorrect Answer

    10 km/hr

    Correct Answer

    15 km/hr

    Incorrect Answer

    20 km/hr

    Incorrect Answer
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    Explanation:

    8/x+2)+(8/x-2)=100/60

    16x/x^2-4 = 5/3

    5x^2-48x-20=0

    x=(50,-2)/5, x=10

    Hence, option 2 is the correct answer.

    By: Amit Kumar
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