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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 $60km/h$ and $90 km/h$, respectively. What is the average speed in $km/h$ for the entire journey?

  1. $72\hspace{0.2cm} km/h$
  2. $73\hspace{0.2cm} km/h$
  3. $74\hspace{0.2cm} km/h$
  4. $75 \hspace{0.2cm}km/h$
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