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
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