Multiple Choice Questions on A sailor goes 12 km downstream in 48 minutes and returns in 1 hour 20 minutes The speed of the sailo........... for Uttarakhand Civil Services (UKPCS) Preparation

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Multiple Choice Questions

A sailor goes 12 km downstream in 48 minutes and returns in 1 hour 20 minutes The speed of the sailo...........

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    A sailor goes 12 km downstream in 48 minutes and returns in 1 hour 20 minutes. The speed of the sailor in still water is

    12 km/hr

    Correct Answer

    12.5 km/hr

    Incorrect Answer

    13 km/hr

    Incorrect Answer

    15 km/hr

    Incorrect Answer
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    Explanation:

    Downstream speed, D = (12/4)/5 = (12 × 5)/4 = 15 km/h
    Upstreeam speed, U = 12/(1 + 1/3) = (12 × 3)/4 = 9 km/h
    Speed of the boat in still water = 15 + 9/2 = 24/2 = 12 km/hr

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