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GATE BT 2018 | GA | Question: 6

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An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at $60$ km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey?

  1. $72$
  2. $73$
  3. $74$
  4. $75$

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