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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-8

  • question_answer
    An aeroplane flies along the four sides of a square at the speeds of 200, 400, 600 and 800 km/h. Find the average speed of the plane around the field.

    A) \[384\text{ }km/h\]                    

    B)  \[370\text{ }km/h\]       

    C)        \[368\text{ }km/h\]        

    D)         None of these               

    Correct Answer: A

    Solution :

    Let each side of the square be x km and let the average speed of the plane around the field be y km/h. Then, \[\frac{x}{200}+\frac{x}{400}+\frac{x}{600}+\frac{x}{800}=\frac{4x}{y}\]             \[\Rightarrow \]  \[\frac{25x}{2400}=\frac{4x}{y}\]  \[\Rightarrow \] \[y=\left( \frac{2400\times 4}{25} \right)=384.\] \[\therefore \]   Average speed \[=384\text{ }km/h.\]


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