A person starting from his house covers a distance at 20 km/hr and returns to the starting place at 30 km/hr. His average speed during whole journey is

 

  • Option 1)

     

    25 km/hr  

     

  • Option 2)

     

    24 km/hr   

     

  • Option 3)

     

    20  km/hr    

     

  • Option 4)

     

    22 km/hr

     

  • Option 5)

     

    27  km/hr    

     

Answers (1)

Average\ Speed = \frac{2xy}{x+y}

                                    = \frac{2*20*30}{50} = 24\ Km/hr

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