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  • Question
  • Mr. Bundda travels in this car and covers 1/4 part of his journey with 8 km/h, 3/5 part with 6 km/h and remaining 3/20 part with a speed of 10 km/h. Find out his average speed during the whole journey.


  • Options
  • A. 6.83 km/h
  • B. 9 km/h
  • C. 4 k/h
  • D. 8.5 km/h

  • Correct Answer
  • 6.83 km/h 

    Explanation

    According to the average speed formula,
    P = 1/4, Q =3/5, R = 3/20
    x = 8 km/h, y = 6 km/h, z = 10km/h
    ? Required average speed = 1 / [(P/x) + (Q/y) + (R/z)]
    =1 / [(1/32) + (1/10) + (3/200)]
    = 1/[(25 + 80 + 12)/800]
    = 800/117
    = 6.83 km/h


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