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  • Question
  • Columbus started his journey from Lucknow to Kolkata, Which is 200 K.M., at the speed of 40 KM/hr, then he went to Banglore which is 300 Km, at the speed of 20 KM/hr . Further he went to Ahmedabad which is 500 Km, at the speed of 10 Km/hr. The average speed of Columbus is :


  • Options
  • A. 14 2/7 KM/hr
  • B. 14 5/7 KM/hr
  • C. 15.6 KM/hr
  • D. none of these

  • Correct Answer
  • 14 2/7 KM/hr 

    Explanation

    Total distance = (200 + 300 + 500) = 1000
    Total time = 200/40 + 300/20 + 500/10 = 5 + 15 + 50 = 70 hr

    Average speed = Total distance / Total time =1000 / 70 = 14.2857 Km/hr.


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    • 2. 
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