3 person A, B and C covers a distance at 10 km/hr ,12 km/hr and 15 km/hr. the average speed is:

 

  • Option 1)

     

    11 km/hr  

     

  • Option 2)

     

    12 km/hr   

     

  • Option 3)

     

    9 km/hr 

     

  • Option 4)

     

    14 km/hr

     

  • Option 5)

     

    7 km/hr 

     

Answers (1)

Average Speed = 3xyz)/(xy + yz + zx)

                           = (3 x 10 x 12 x 15)/(120 + 150 + 180) => 12 K/hr 

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