Multiple Choice Questions on A boat running downstream covers a distance of 40km in 4hrs and covering the same distance upstream ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A boat running downstream covers a distance of 40km in 4hrs and covering the same distance upstream ...........

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    A boat running downstream covers a distance of 40km in 4hrs and covering the same distance upstream in 8hrs. What is the speed of a boat in still water.

    6km/hr

    Incorrect Answer

    7km/hr

    Incorrect Answer

    7.5km/hr

    Correct Answer

    8.5km/hr

    Incorrect Answer
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    Explanation:

    Downstream speed=40/4=10km/hr
    Upstream speed=40/8=5km/hr
    So speed of boat in still water=(10+5)/2=15/2
    =7.5km/hr

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