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Q: One-fifth of a journey is covered at a speed of 30 km/h, one-fourth of the journey at a speed of 25 km/h and the rest at 60 km/h. What is the average speed (in km/h, correct to one decimal place) for the whole journey?
  • A. 38.7
  • B. 30.6
  • C. 40.5
  • D. 25.4
Correct Answer: Option A -
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Explanations:

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