Multiple Choice Questions on A boat running rows downstream covers a distance of 20 km in 2 hrs while it covers the same distance........... for Uttarakhand Civil Services (UKPCS) Preparation

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Multiple Choice Questions

A boat running rows downstream covers a distance of 20 km in 2 hrs while it covers the same distance...........

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    A boat running rows downstream covers a distance of 20 km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is ?

    7 km/hr

    Correct Answer

    8 km/hr

    Incorrect Answer

    9 km/hr

    Incorrect Answer

    10 km/hr

    Incorrect Answer
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    Explanation:

    Downstream speed, D = 20 km/2hrs = 10 km/h
    Upstream speed, U = 20 km/5hr = 4 km/h
    Speed of boat in still water = D + U/2
    = 10 + 4/2 = 7 km/h

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