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Q: A man travels from P to Q at the speed of 60km/h and travels from Q to P at the speed of 90km/h. What is the average speed of the man for the whole journey?
  • A. 75 km/h
  • B. 78 km/h
  • C. 70 km/h
  • D. 72 km/h
Correct Answer: Option D -
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Explanations:

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