Multiple Choice Questions on A man can row 6 km hr in still water When the river is running at 2 km hr it takes him 1 frac12 hr t........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A man can row 6 km hr in still water When the river is running at 2 km hr it takes him 1 frac12 hr t...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A man can row 6 km/hr in still water. When the river is running at 2 km/hr, it takes him 1 ½ hr to row to a place and come back. How far is the place?

    2.5 km

    Incorrect Answer

    4 km

    Correct Answer

    5 km

    Incorrect Answer

    10 km

    Incorrect Answer
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    Explanation:

    B is speed of boat in still water, R is speed of stream
    Time is total time taken for upstream and downstream
    Distance = time * [B^2 – R^2] / 2*B
    = 3/2 * [6^2 – 2^2] / 2*6
    = 4 km

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