![An automobile travels from city A to city B and returns to city A by the same route](https://www.gkseries.com/blog/wp-content/uploads/2023/09/An-automobile-travels-from-city-A-to-city-B-and-returns-to-city-A-by-the-same-route.jpg)
Q. 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?
(A) 72 (B) 73 (C) 74 (D) 75
Ans: 72
Sol:
Total distance=x
(Onward journey) S1=60km/h
(Return journey) S2=90km/h
![](https://www.gkseries.com/blog/wp-content/uploads/2023/09/Screenshot-890.png)